suppose a student conducted a titration of an unknown solution of the weak acid ch3cooh with 0.880 m naoh. first, the student diluted 15.0 ml of the ch3cooh solution with 85.0 ml of water in an erlenmeyer flask and added 2 drops of the indicator, phenolphthalein. then, 0.880 m naoh was titrated into the diluted ch3cooh solution until the color of the solution changed to pink and the end point of the titration was reached. at the end point, 6.80 ml of 0.880 naoh was added to the ch3cooh solution. calculate the concentration of the ch3cooh solution.
The concentration of the CH₃COOH solution is 0.0399 M.
The balanced chemical equation for the reaction between CH₃COOH and NaOH is:
CH₃COOH + NaOH → CH₃COONa + H₂O
From the equation, it can be seen that one mole of NaOH reacts with one mole of CH₃COOH. Therefore, the number of moles of NaOH used in the titration is:
0.880 mol/L × 0.00680 L = 0.00598 mol
Since the dilution did not affect the number of moles of CH₃COOH, the number of moles of CH₃COOH in the original solution is also 0.00598 mol.
The volume of the original solution used in the titration is:
15.0 mL/100.0 mL = 0.15
Therefore, the concentration of the CH3COOH solution is:
0.00598 mol/0.15 L = 0.0399 M
As a result, the CH₃COOH solution has a concentration of 0.0399 M.
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at the equivalence point for a weak acid-strong base titration, an equal number of h and oh- have reacted, producing a solution of water and salt. what affects the ph at the equivalence point for this kind of titration?
The pH at the equivalence point for a weak acid-strong base titration is affected by the dissociation constant of the weak acid and the hydrolysis of the resulting salt, leading to a pH above 7 at the equivalence point.
The pH at the equivalence point for a weak acid-strong base titration is affected by two main factors: the dissociation constant (Ka) of the weak acid and the hydrolysis of the resulting salt.
1. Dissociation constant (Ka) of the weak acid: The Ka represents the extent to which the weak acid ionizes in water. A smaller Ka value indicates a weaker acid, which means it ionizes less in solution. Since the equivalence point occurs when equal amounts of H+ and OH- ions have reacted, the degree of ionization of the weak acid will influence the pH of the solution.
2. Hydrolysis of the resulting salt: When a weak acid reacts with a strong base, a salt and water are formed. The anion of the salt, which is a conjugate base of the weak acid, can undergo hydrolysis, reacting with water to form a small amount of the weak acid and hydroxide ions (OH-). This hydrolysis increases the concentration of OH- ions in the solution, leading to a pH above 7 at the equivalence point.
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which species would increase the concentration of hydroxide in solution the most? select the correct answer below: weak base strong base weak acid strong acid
The correct answer is option B. Strong bases are molecules that can release hydroxide ions (OH-) into a solution when dissolved in water.
These molecules can neutralise other molecules with lower pHs (acids) and raise the concentration of hydroxide ions in the solution because of their relatively high pH.
Hydroxide ions can react with both acids and bases to create water molecules because they are the conjugate base of water and are amphoteric.
By aggressively releasing hydroxide ions and neutralising any present acids, strong bases effectively raise the concentration of hydroxide ions in the solution.
Strong bases are typically the best option when attempting to raise the concentration of hydroxide ions in a solution due to their characteristics.
Complete Question:
Which species would increase the concentration of hydroxide in solution the most? select the correct answer below:
A. weak base
B. strong base
C. weak acid
D. strong acid
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8. a second-order reaction has a half-life of 18 s when the initial concentration of reactant is 0.71 m. calculate the rate constant for this reaction
The rates are constant for this reaction 0.0782 M⁻¹s⁻¹. Second-order reactions are those in which the total of the exponents in the appropriate rate law of the chemical reaction equals two.
Second-order reactions are chemical processes that depend on either the concentrations of two first-order reactants or the concentration of one second-order reactant, according to the rate law equations provided below. A chemical reaction's half-life is the length of time it takes for half of the reactant to move through the reaction.
Second-order kinetics can be used to explain a variety of significant biological processes, including the creation of double-stranded DNA from two complementary strands. The total of the exponents in the rate law is equal to two in a second-order reaction. In this section, the two most typical types of second-order reactions will be thoroughly covered.
The differential (derivative) rate equation and the integrated rate equation are used to explain how the rate of a second-order reaction varies with the concentration of reactants or products. The integrated rate equation demonstrates how the concentration of species varies over time, whereas the differential rate law demonstrates how the reaction's rate changes over time.
Second order reaction for calculating rate constant is
t1/2 = 1/KCAO
Half-Life period = 18 s
Initial Concentration of reactant = 0.71M
18s = 1/K(0.71M)
K = 0.0782 M⁻¹s⁻¹
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the proportion of parent to daughter isotopes in a mineral is 40% parent and 60% daughter. how many half-lives have elapsed since the mineral contained 100% parent atoms?
The ratio between 1 and 2 half lives that have elapsed since the mineral contained 100% parent atoms.
Let us consider that the parent isotope decays into the daughter isotope through a process of radioactive decay with a constant half-life.
we can use the fact of the half life which is the proportion of parent to daughter isotopes which changes over the time. We have to determine that how many half-lives have elapsed since the mineral contained 100% parent atoms.
We have the proportion of parents to daughter isotopes in the mineral is 40% parent and 60% daughter. So the ratio becomes 2:3 parent to daughter isotopes.
Calculating the current ratio of 2:3 is closest to the ratio of 1:3 which occurs after two half-lives of the mineral. So we get the ratio between 1 and 2 half-lives which have elapsed since the mineral contained 100% parent atoms.
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what is the percent concentration by mass if 7.24 g of barium fluoride are mixed with 51.35 g of distilled water to form a solution?
The percent concentration by mass when 7.24 g of barium fluoride are mixed with 51.35 g of distilled water to form a solution is 12.36%.
The percent concentration by mass can be calculated using the formula:
Percent concentration = (mass of solute / mass of solution) x 100
First, we need to find the mass of the solution by adding the mass of barium fluoride (7.24 g) and the mass of distilled water (51.35 g):
Mass of solution = 7.24 g + 51.35 g = 58.59 g
Now, we can calculate the percent concentration:
Percent concentration = (7.24 g / 58.59 g) x 100 ≈ 12.36%
So, the percent concentration by mass of the solution is approximately 12.36%.
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according to the arrhenius concept, if hno3 were dissolved in water, it would act as . group of answer choices a source of h- ions a proton acceptor an acid a source of hydroxide ions a base
According to the Arrhenius concept, if HNO3 were dissolved in water, it would act as an acid. This is the correct answer.
This is because HNO3 would donate a proton (H+) to the water, increasing the concentration of H+ ions in the solution. The Arrhenius concept is a definition of acids and bases proposed by Svante Arrhenius in 1884.
According to this concept, an acid is a substance that produces hydrogen ions (H+) when dissolved in water, while a base is a substance that produces hydroxide ions (OH-) when dissolved in water.HNO3 is an example of an acid because it produces H+ ions when dissolved in water.
This can be seen from the following equation:
HNO3 + H2O → H3O+ NO3
In this equation, HNO3 donates an H+ ion to the water molecule, forming H3O+.
Therefore, HNO3 acts as an acid when dissolved in water.
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Give 2 processes in which particles will lose or gain energy.
The 2 processes in which the particles will lose or gain energy are:
1) Temperature Change Or
2) State Change
A particle losses or gains energy when its Temperature changes i.e. A vessel filled with boiling water (100 degrees C ) cools down at the room temperature OR
when its State changes i.e. A bucket full of ice is kept at a room temperature (state changes from Solid to Liquid)
It is because of the breaking or formation of bonds, which results in loss or gain in energy.
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three students are asked to discuss the percent error obtained in this lab. which student employs correct scientific reasoning? group of answer choices the percent error could be caused by the salt not completely dissolving, therefore the change in heat per mole would be accidentally low. the percent error could be caused by mixing the reaction too quickly, the friction caused by mixing would increase the change in heat measured. the percent error could be caused by the change in ph of the solution, this would decrease the change in heat accidentally.
The correct student with scientific reasoning is the first student who states that the percent error could be caused by the salt not completely dissolving, which would result in a lower measured change in heat per mole. This is a valid scientific reasoning as the dissolving of the salt is an important factor that affects the change in heat during the reaction.
The percent error could be caused by the salt not completely dissolving, therefore the change in heat per mole would be accidentally low. The percent error could be caused by mixing the reaction too quickly, the friction caused by mixing would increase the change in heat measured. The percent error could be caused by the change in pH of the solution, this would decrease the change in heat accidentally.
The second student's statement that the percent error could be caused by mixing the reaction too quickly is not a valid scientific reasoning, as mixing does not affect the change in heat produced by the reaction.
The third student's statement that the percent error could be caused by the change in pH of the solution decreasing the change in heat is also not a valid scientific reasoning, as a change in pH would not affect the change in heat produced by the reaction.
Therefore, the first student provides the correct scientific reasoning for the possible cause of the percent error in the lab.
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Suppose only 5,550J heat was used to warm up the same 55.0g of water. If the water started out at 25 degrees celsius what would its final temperature become?
Answer:
What is the heat in joules required to raise the temperature of 25 grams of water from 0 degrees C to 100 degrees C? What is the heat in calories? Answer: 10450 J or 2500 calories of heat energy are required to raise the temperature of 25 grams of water from 0 degrees C to 100 degrees C.
What happens to the surroundings during an endothermic reaction?
Answer: The surroundings will lower in temperature.
Explanation:
Endothermic reactions draw heat from the surroundings in order to occur. So the surroundings will feel cold, as the heat is being used as energy in the reaction.
Find the mass, in grams, of 11.2 L H2.
The mass of 11.2 L of H2 gas at STP is 1.008 grams.
To find the mass of hydrogen gas in 11.2 L, we need to use the ideal gas law, which relates the pressure (P), volume (V), number of moles (n), and temperature (T) of a gas:
PV = nRT
where R is the gas constant.
To solve for the mass of H2, we need to know the pressure, temperature, and number of moles of the gas. Let's assume that the H2 is at standard temperature and pressure (STP), which is 0 degrees Celsius (273.15 K) and 1 atmosphere of pressure (101.3 kPa).
At STP, 1 mole of any gas occupies 22.4 L of volume. Therefore, the number of moles of H2 in 11.2 L can be calculated as:
n = (11.2 L) / (22.4 L/mol) = 0.5 mol
Now we can use the molar mass of hydrogen (2.016 g/mol) to convert the number of moles to mass:
mass = n x molar mass = 0.5 mol x 2.016 g/mol = 1.008 g
Therefore, the mass of 11.2 L of H2 gas at STP is 1.008 grams.
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Methane gas and chlorine gas react to form hydrogen chloride gas and carbon tetrachloride gas. What volume of carbon tetrachloride would be produced by this reaction if 5.0 mL of chlorine were consumed? Also, be sure your answer has a unit symbol, and is rounded to the correct number of significant digits.
Answer:
When 5.0 mL of chlorine gas is consumed, 1.3 mL of carbon tetrachloride gas is produced.
Explanation:
The balanced chemical equation for the reaction between methane gas and chlorine gas is:
CH4(g) + 4Cl2(g) → 4HCl(g) + CCl4(g)
From this equation, we can see that for every 4 moles of chlorine gas that react, 1 mole of carbon tetrachloride is produced.
To determine the volume of carbon tetrachloride produced when 5.0 mL of chlorine gas is consumed, we need to use the ideal gas law. Assuming standard temperature and pressure (STP), which is 0°C and 1 atm, the volume of one mole of any ideal gas is 22.4 L.
First, we need to calculate the number of moles of chlorine gas consumed:
n(Cl2) = V(Cl2) / Vm(Cl2)
n(Cl2) = 5.0 mL / 22.4 L/mol
n(Cl2) = 0.00022321 mol
According to the balanced equation, 4 moles of chlorine gas react to produce 1 mole of carbon tetrachloride. Therefore, the number of moles of carbon tetrachloride produced is:
n(CCl4) = n(Cl2) / 4
n(CCl4) = 0.00022321 mol / 4
n(CCl4) = 5.58025 x 10^-5 mol
Finally, we can calculate the volume of carbon tetrachloride produced using the ideal gas law:
V(CCl4) = n(CCl4) x Vm(CCl4)
V(CCl4) = 5.58025 x 10^-5 mol x 22.4 L/mol
V(CCl4) = 0.001251 L
Rounding to the correct number of significant digits, the volume of carbon tetrachloride produced is 0.0013 L or 1.3 mL.
Therefore, when 5.0 mL of chlorine gas is consumed, 1.3 mL of carbon tetrachloride gas is produced.
Calculate the decrease in temperature when 8.5 L at 25.0 °C is compressed to 4.00 L.
The decrease in temperature when 8.5 L at 25.0 °C is compressed to 4.00 L is 86.7 °C.
This is a problem involving the ideal gas law, which relates pressure (P), volume (V), number of moles (n), and temperature (T) of a gas:
PV = nRT
where R is the gas constant. Assuming the number of moles is constant, we can write:
P₁V₁/T₁ = P₂V₂/T₂
where the subscripts 1 and 2 refer to the initial and final states of the gas, respectively.
We can use this equation to solve for the final temperature (T₂), given the initial conditions (P₁ = 1 atm, V₁ = 8.5 L, and T₁ = 25.0 °C) and the final volume (V₂ = 4.00 L):
P₁V₁/T₁ = P₂V₂/T₂
T₂ = (P₂V₂/T₁) * [tex](P₁V₁)^-1[/tex]
The pressure (P) is not given, but we can assume that it remains constant during the compression process, which is a reasonable assumption if the compression is slow and controlled. Let's assume a pressure of 1 atm.
T₂ = (1 atm * 4.00 L / (25.0 °C + 273.15)) *[tex](1 atm * 8.5 L)^-1[/tex]
T₂ = 211.5 K
The final temperature of the compressed gas is 211.5 K. To calculate the decrease in temperature, we need to find the change in temperature from the initial temperature of 25.0 °C:
ΔT = T₂ - T₁
ΔT = 211.5 K - (25.0 °C + 273.15)
ΔT = -86.7 °C.
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a buffer can not be destroyed by adding too much strong base. it can only be destroyed by adding too much strong acid. false 2. adding 0.1 mol solid naoh to a 1.0 l of 0.2 m hcl solution could prepare a buffer. false 3. adding a small amount of acid to a buffer increases the ph of the buffer.
The following statements on solutions, the following are as, 1- false. 2- false. 3- false.
1. The statement "a buffer can not be destroyed by adding too much strong base. it can only be destroyed by adding too much strong acid" is false. While it is true that buffers are most commonly used to resist changes in pH caused by the addition of strong acid, adding too much strong base can also destroy a buffer.
This is because a buffer works by containing both a weak acid and its conjugate base (or a weak base and its conjugate acid). If too much strong base is added to a buffer, it can convert the weak acid to its conjugate base, removing the buffer capacity.
2. The statement "adding 0.1 mol solid naoh to a 1.0 l of 0.2 m hcl solution could prepare a buffer" is false. In order to prepare a buffer, you need to have both a weak acid and its conjugate base (or a weak base and its conjugate acid) present in the solution.
The addition of NaOH to HCl will only create a strong acid-base reaction that will result in the formation of salt and water.
3. The statement "adding a small amount of acid to a buffer increases the ph of the buffer" is also false. When a small amount of acid is added to a buffer, the buffer will resist the change in pH caused by the addition of the acid.
This is because the buffer contains both a weak acid and its conjugate base (or a weak base and its conjugate acid), which can neutralize the added acid. As a result, the pH of the buffer will remain relatively unchanged.
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aluminum is produced commercially by the electrolysis of al2o3 in the presence of a molten salt. if a plant has a continuous capacity of 1.15 million amp, what mass of aluminum can be produced in 2.40 h?
The mass of aluminum that can be produced in 2.40 h is 1390 kg aluminum production by Electrolysis.
The amount of aluminum produced can be calculated using Faraday's law, which states that the amount of substance produced is directly proportional to the amount of electric charge passed through the cell, and the molar mass of the substance.
The balanced chemical equation for the electrolysis of [tex]Al_2O_3[/tex] is:
[tex]2 Al_2O_3(l)[/tex] -> [tex]4 Al(l) + 3 O_2(g)[/tex]
From the equation, we see that for every 4 moles of aluminum produced, 6 moles of electrons are needed.
The charge passed through the cell can be calculated using the formula:
charge = current × time
Where current is measured in amperes (A) and time is measured in hours (h). We need to convert 2.40 h to seconds:
[tex]2.40* 3600 = 8640 s[/tex]
The charge passed through the cell is:
charge = 1.15 million A × 8640 s = [tex]9.936 * 10^9[/tex] C
The number of moles of electrons passed through the cell can be calculated as:
moles of electrons = charge / Faraday's constant
Where Faraday's constant is 96,485 C/mol.
moles of electrons = [tex]\frac{9.936 * 10^9}{96,485} = 103,068[/tex] mol
Therefore, the number of moles of aluminum produced is half of the number of moles of electrons, or:
moles of Al = 0.5 × (103,068 mol) = 51,534 mol
The mass of aluminum produced can be calculated using the molar mass of aluminum, which is 26.98 g/mol:
mass of Al = moles of Al × molar mass of Al
mass of Al = [tex]51,534 * 26.98 = 1.39 * 10^6[/tex] g or 1390 kg
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Using the "NAS" idea, how many electrons are "needed" for the compound PBr3?
A. 12
B. 32
C. 26
D. 21
Answer:
32
Explanation:
according to the galvanic cell video provided in the introduction page of this module, which statement is true about the four main parts of the galvanic cell? group of answer choices the anode is the electrode that receives electrons. an external circuit with a multimeter will be used to transfer electrons. there are two electrodes and they will be immersed in the same metal solutions. the cathode is the electrode where oxidation occurs. salt bridge will only be placed in one of the cells.
According to galvanic cell video which is provided in the introduction page of this module, the statement which is true about the four main parts of the galvanic cell will be; "The cathode will be the electrode where reduction can occurs." Option D is correct.
A galvanic cell, also termed as a voltaic cell, in an electrochemical cell which uses a spontaneous redox reaction to generate an electric current. The cell consists of two half-cells, each containing an electrode and an electrolyte solution. The two half-cells are connected by a wire as well as a salt bridge.
The other statements are not correct; The anode is the electrode where oxidation occurs, not where it receives electrons.
An external circuit with a voltmeter (not multimeter) is used to measure the potential difference (voltage) between the two electrodes.
There are two electrodes, but they are immersed in different solutions (not the same metal solutions).
The salt bridge is placed in both cells to allow the flow of ions to maintain electrical neutrality, not just in one cell.
Hence, D. is the correct option.
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--The given question is incomplete, the complete question is
"According to the galvanic cell video provided in the introduction page of this module, which statement is true about the four main parts of the galvanic cell? group of answer choices A) the anode is the electrode that receives electrons. B) an external circuit with a multimeter will be used to transfer electrons. C) there are two electrodes and they will be immersed in the same metal solutions. D) the cathode is the electrode where oxidation occurs. E) salt bridge will only be placed in one of the cells."--
What are likely formulas for the following molecules?
(a) NH2OH
(b) AlCl2
(c) CF2Cl2
(d) CH2O
(a) NH2OH- Nitrogen is a group 5 element and has 5 valence electrons. Oxygen is a group 6 element and has 6 valence electrons. Hydrogen is a group 1 element and has 1 valence electron. Therefore, NH2OH has the formula: NH2OH
(b) AlCl2- Aluminum is a group 3 element and has 3 valence electrons. Chlorine is a group 7 element and has 7 valence electrons. Therefore, AlCl2 has the formula: AlCl2
(c) CF2Cl2- Carbon is a group 4 element and has 4 valence electrons. Fluorine is a group 7 element and has 7 valence electrons. Chlorine is a group 7 element and has 7 valence electrons. Therefore, CF2Cl2 has the formula: CF2Cl2
(d) CH2O- Carbon is a group 4 element and has 4 valence electrons. Oxygen is a group 6 element and has 6 valence electrons. Hydrogen is a group 1 element and has 1 valence electron. Therefore, CH2O has the formula: CH2O
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Ammonia and gaseous hydrogen chloride combine to form ammonium chloride according to this equation:
NH3(g) + HCl(g) → NH4Cl(s)
If 4.21 L of NH3(g) at 27°C and 1.02 atmospheres is combined with 5.35 L of HCl(g) at 26°C and 0.998 atmospheres, what mass of NH4Cl(s) will be produced? Which gases are the limiting and excess reactants?
Explanation:
To solve this problem, we first need to calculate the number of moles of NH3 and HCl using the ideal gas law:
n = PV / RT
where:
P = pressure in atmospheres
V = volume in liters
T = temperature in kelvins
R = 0.08206 L atm/mol K (the ideal gas constant)
For NH3:
n(NH3) = (1.02 atm) (4.21 L) / (0.08206 L atm/mol K) (300 K)
n(NH3) = 0.177 mol
For HCl:
n(HCl) = (0.998 atm) (5.35 L) / (0.08206 L atm/mol K) (299 K)
n(HCl) = 0.204 mol
From the balanced equation, we can see that the stoichiometry of NH3 to HCl is 1:1, so NH3 is the limiting reactant since it has fewer moles. The balanced equation also tells us that the ratio of NH3 to NH4Cl is 1:1, so the number of moles of NH4Cl produced is also 0.177 mol.
To calculate the mass of NH4Cl produced, we need to use the molar mass of NH4Cl:
M(NH4Cl) = 14.01 g/mol (N) + 4(1.01 g/mol) (H) + 35.45 g/mol (Cl)
M(NH4Cl) = 53.49 g/mol
mass(NH4Cl) = n(NH4Cl) × M(NH4Cl)
mass(NH4Cl) = 0.177 mol × 53.49 g/mol
mass(NH4Cl) = 9.48 g
Therefore, the mass of NH4Cl produced is 9.48 g.
To determine the excess reactant, we can calculate how much of each reactant is consumed based on the stoichiometry of the reaction. Since NH3 and HCl react in a 1:1 ratio, we can assume that all of the NH3 is consumed, so we need to calculate the amount of HCl that is consumed:
n(HCl) consumed = n(NH3) = 0.177 mol
n(HCl) initially = (0.998 atm) (5.35 L) / (0.08206 L atm/mol K) (299 K)
n(HCl) initially = 0.204 mol
n(HCl) excess = n(HCl) initially - n(HCl) consumed
n(HCl) excess = 0.204 mol - 0.177 mol
n(HCl) excess = 0.027 mol
To convert this to a volume, we can use the ideal gas law:
V(HCl) excess = n(HCl) excess × RT / P
V(HCl) excess = 0.027 mol × (0.08206 L atm/mol K) (299 K) / (0.998 atm)
V(HCl) excess = 0.686 L
Therefore, the excess reactant is HCl, and the limiting reactant is NH3.
what is the molecular geometry of the following and would you expect it to have a dipole moment? group of answer choices square planar, no octahedral, yes tetrahedral, yes octahedral, no square planar, yes
The molecular geometry of a given element is octahedral and it has no dipole moment. Therefore octahedral, No would be the correct answer.
The SF6 molecule has no dipole moment because each S−F bond dipole is balanced by one of equal magnitude pointing in the opposite direction of the other side of the molecule.
The three-dimensional configuration of the atoms that make up a molecule is known as molecular geometry. In addition to providing details about the molecule's overall shape, it also provides data on the bond lengths, bond angles, torsional angles, and any other geometrical factors that affect each atom's position.
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what is the temperature of 1.2 moles of Helium gas at 1950mm Hg if it occupies 15,500 ml of volume?
The temperature of 1.2 moles of Helium gas at 1950 mm Hg if it occupies 15,500 ml of volume is 131°C.
We know we want to use the ideal gas law because we have the moles, pressure, and volume and we want to get the pressure: PV = nRT, where P = pressure, V = volume, n = number of moles, R = gas constant, and T = Kelvin temperature.
Here, the following values are given: 1950 mmHg of pressure, 15,500 mL (15.5 L), 1.2 mol of material, and R = 62.3638 (according to a table of gas constants). To the equation, include these:
Solve for temperature as follows: (1950) x (15.5 L) = (1.2) x (62.3638) x Temperature Temperature = 403.88 K.
We can convert this to degrees Celsius by subtracting 273 from the total:
3 sig figs = 403.88 - 273 = 130.88 - 131 (3 sig figs)
This causes the temperature to be 131°C.
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Determine the number of moles (n) for 22.5 g of carbon dioxide with a molecular formula of CO₂
There are 0.511 moles of CO 2 in 22.5 gm of the substance
Determine the number of moles of carbon dioxide, we need to use the molecular weight of CO₂ and the given mass of 22.5 g.
The molecular weight of CO₂ is:
c = 12.01 gm/mol
o = 16.00 gm/mol
2 x o = 2 x 16.00 gm/mol = 32.00 gm/mol
So, the molecular weight of CO₂ is 12.01 gm/mol + 32.00 gm/mol = 44.01 gm/mol.
Now, we can use the formula:
no of moles = Given mass / Molar mass
where n is the number of moles, m is the given mass, and M is the molecular weight.
Plugging in the values, we get:
n = 22.5 g / 44.01 g/mol
n = 0.511 moles"
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What is the freezing point in ºC of a 2.20 molal solution of lithium bromide in water?
Hence, a 2.20 molal solution of lithium bromide in water has a freezing point that is roughly -0.00409 °C.
What is water-based lithium bromide solution?In absorption refrigeration systems, the bromide lithium water (LiBr/H2O) solution is frequently employed as the working fluid since it is nonvolatile, nontoxic, and does not deplete the ozone layer.
We can use the following formula to get a solution's freezing point depression: ΔTf = Kf * molality
1.86 °C/m is the freezing point depression constant for water.
Inputting the values provided yields:
molality = 2.20 mol of LiBr / 1000 g of water
molality = 0.00220 mol/g
ΔTf = (1.86°C/m) * (0.00220 mol/g)
ΔTf = 0.00409°C
The freezing point of the solution is:
freezing point = 0°C - ΔTf
freezing point = 0°C - 0.00409°C
freezing point = -0.00409°C
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describe the reaction that replenishes nad . name the reactants that get reduced and oxidized. what are the products, and where do they go next
Tthe reaction that replenishes( NAD+) involves the oxidation of NADH and the reduction of oxygen. The products are( NAD+), water, and ATP, which are then used in various cellular processes.
The reaction that replenishes( NAD+) is called cellular respiration, specifically, the oxidation of NADH back to( NAD+). This process occurs in the electron transport chain, which is a part of cellular respiration. The products are (NAD+), water, and ATP, which are then used in various cellular processes.
In this reaction, NADH is oxidized, meaning it loses electrons, and returns to its original form, (NAD+). This is essential for maintaining the balance of (NAD+ )and NADH in the cell and ensuring that glycolysis, the citric acid cycle, and other cellular processes can continue.
The reactant that gets reduced is oxygen (O2). Oxygen is the final electron acceptor in the electron transport chain and is essential for aerobic respiration. When oxygen accepts electrons, it is reduced to form water ([tex]H2O[/tex]).
The products of this reaction are ([tex]NAD+[/tex]), water, and energy in the form of ATP.( NAD+) is recycled and can be used again in glycolysis and the citric acid cycle to help generate more ATP. Water is a byproduct of the reaction and can be used for various cellular processes or excreted as waste.
The ATP generated is used as a source of energy for various cellular activities, including growth, maintenance, and repair.
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Calculate the Heat of Formation for the following reaction.
2NO + O2 ---> 2NO2
The heat of formation of the given reaction is -56.4 kJ/mol.
What is Heat?
Heat is a form of energy that flows from a hotter object to a colder object. It is a type of energy transfer that occurs due to a temperature difference between two objects. The direction of heat flow is always from the object with higher temperature to the object with lower temperature until they reach thermal equilibrium.
The heat of formation of a compound is defined as the enthalpy change when one mole of the compound is formed from its constituent elements in their standard states at a given temperature and pressure. The standard state of an element is its most stable form at 1 atm pressure and a specified temperature.
Using the heat of formation values from standard tables, we can calculate the heat of formation of the products and reactants in the given reaction as follows:
Heat of formation of NO2 = -33.2 kJ/mol
Heat of formation of NO = +90.3 kJ/mol (since NO is an unstable gas at room temperature, we use the heat of formation of NO at 298 K instead of the standard heat of formation)
Heat of formation of O2 = 0 kJ/mol
Therefore, the heat of formation of the given reaction is:
ΔHf = Σ(heat of formation of products) - Σ(heat of formation of reactants)
ΔHf = [2(-33.2 kJ/mol)] - [2(90.3 kJ/mol) + 0 kJ/mol]
ΔHf = -56.4 kJ/mol
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at a given temperature, which gas has the lowest average molecular speed? 1. nitrogen 2. fluorine 3. carbon monoxide 4. carbon dioxide 5. chlorine
The gas with the slowest average molecular speed at a particular temperature is chlorine, or Cl2. The right answer is 5.
The formula for the typical molecular speed is:
The atomic speed is 1/M.
Where,
The molecular mass is M.
N2 has a molecular weight of 28.01 g/mol.
F2 has a molecular weight of 37.99 g/mol.
Carbon monoxide has a molecular weight of 28.01 g/mol.
Cl2 has a molecular weight of 70.90 g/mol.
The average molecular speed decreases with increasing molecule mass. The average molecular speed increases with decreasing molecular weight.
The chlorine has the slowest average molecular speed as a result.
The substance with the slowest average molecular speed is chlorine, or Cl2. Hence option 5 is correct.
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8.97998 in significant figure
Answer: 8.98 (rounded to two significant figures)
Explanation:
Answer:
9
Explanation:
8.97998 to the nearest significant figure.
if 0.090 mole of solid naoh is added to 1.0 liter of 0.180 m ch3cooh, what will the ph of the resulting solution be?
If 0.090 mole of solid NaOH is added to 1.0 liter of 0.180 m [tex]CH_3COOH[/tex]. The pH of the resulting solution is 4.74.
To solve this problem, we need to use the equation for the dissociation of acetic acid:
[tex]CH_3COOH + H_2O[/tex]⇌ [tex]CH_3COO^{-} + H_3O^+[/tex]
The addition of solid NaOH will react with the acetic acid to form sodium acetate and water:
[tex]CH_3COOH + NaOH[/tex] → [tex]CH_3COO^{-} Na^{+} + H_2O[/tex]
To calculate the pH of the resulting solution, we need to determine the new concentrations of [tex]CH_3COOH[/tex]and [tex]CH_3COO^-[/tex]. We can use the initial concentration of [tex]CH_3COOH[/tex]and the amount of NaOH added to calculate the new concentration of [tex]CH_3COOH[/tex]:
moles of [tex]CH_3COOH[/tex]= initial concentration x volume = 0.180 M x 1.0 L = 0.180 moles
moles of NaOH = 0.090 moles
moles of [tex]CH_3COOH[/tex]remaining = 0.180 moles - 0.090 moles = 0.090 moles
volume of solution = 1.0 L + 0.090 L = 1.090 L
new concentration of [tex]CH_3COOH[/tex]= moles / volume = 0.090 moles / 1.090 L = 0.0826 M
Since NaOH is a strong base, it will completely dissociate in water to form [tex]Na^+[/tex] and [tex]OH^-[/tex]. The [tex]OH^-[/tex] ions will react with the remaining [tex]CH_3COOH[/tex]to form [tex]CH_3COO^-[/tex], so the new concentration of [tex]CH_3COO^-[/tex] will be equal to the moles of NaOH added:
new concentration of [tex]CH_3COO^-[/tex] = 0.090 moles / 1.090 L = 0.0826 M
Now we can use the equilibrium expression for the dissociation of acetic acid to calculate the pH of the buffer:
[tex]Ka = [CH_3COO^{-}][H_3O^{+}] / [CH_3COOH]\\[H_3O^{+}] = Ka * [CH_3COOH] / [CH_3COO^{-}]\\[H_3O^{+}] = 1.8 * 10^{-5} * 0.0826 M / 0.0826 M\\[H_3O^{+}] = 1.8 * 10^{-5} M\\pH = -log[H_3O^{+}]\\pH = -log(1.8 * 10^{-5})\\pH = 4.74[/tex]
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the second-order decomposition of no2 has a rate constant of 0.255 m-1s-1. how much no2 decomposes in 8.00 s if the initial concentration of no2 (1.00 l volume) is 1.33 m? the second-order decomposition of no2 has a rate constant of 0.255 m-1s-1. how much no2 decomposes in 8.00 s if the initial concentration of no2 (1.00 l volume) is 1.33 m? 0.85 mol 0.97 mol 1.66 mol 1.9 mol 0.36 mol
In 8.00 seconds, approximately 0.84 mol of NO2 decomposes. The closest answer among the given options is 0.85 mol.
To find out how much NO2 decomposes in 8.00 s given the initial concentration and rate constant, we can use the second-order reaction formula:
1/[A]t = kt + 1/[A]₀
Where:
- [A]t is the concentration of NO2 at time t (which we want to find)
- k is the rate constant (0.255 M⁻¹s⁻¹)
- t is the time (8.00 s)
- [A]₀ is the initial concentration of NO2 (1.33 M)
Step 1: Plug the values into the equation.
1/[A]t = (0.255 M⁻¹s⁻¹)(8.00 s) + 1/(1.33 M)
Step 2: Calculate the value on the right side of the equation.
1/[A]t = 2.04 M⁻¹
Step 3: Solve for [A]t (concentration of NO2 at 8.00 s).
[A]t = 1/2.04 M⁻¹ = 0.49 M
Step 4: Calculate the change in concentration (how much NO2 decomposes).
Change in concentration = [A]₀ - [A]t = 1.33 M - 0.49 M = 0.84 M
Step 5: Convert the change in concentration to moles (since the volume is 1.00 L, the change in concentration is equal to the change in moles).
Change in moles = 0.84 mol
So, the correct option is 0.85 as it is closest to the answer.
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