Answer:
178 grams
Explanation:
Took Test
The mass of a sample of NH3 containing 6.3× 10²⁴ molecules of NH₃ is 178 gm , i.e. Option B
What is a mole ?A mole is defined as 6.022 × 10²³ atoms, molecules, ions, or other chemical units.
and the molar mass of a substance is defined as the mass of 1 mole of that substance, expressed in grams per mole.
It is equal to the mass of 6.022 × 10²³ atoms, molecules, or formula units of that substance.
6.022× 10²³ molecules are present in 1 mole
6.3× 10²⁴ molecules will be present in
[tex]\rm =\dfrac{6.3\times 10^{24}}{6.022\times 10^{23} } \;moles[/tex]
= 10.46 moles
Molar mass(1 mole) of NH₃ is 17 gm
10.46 moles will have mass of 10.46* 17 = 178 gm
The mass of a sample of NH₃ containing 6.3× 10²⁴ molecules of NH₃ is 178 gm , i.e. Option B.
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Please help, would be greatly appreciated!
According to the stoichiometry of the given chemical equation 102.03 g of Al₂O₃ is formed from 54 g of aluminium.
What is stoichiometry?It is the determination of proportions of elements or compounds in a chemical reaction. The related relations are based on law of conservation of mass and law of combining weights and volumes.
Stoichiometry is used in quantitative analysis for measuring concentrations of substances present in the sample. As per stoichiometry of the given chemical equation, 107.92 g aluminium gives 203.92 g Al₂O₃, thus 54 g aluminium will give 54×203.92/107.92=102.03 g.
Thus, 102.03 g of Al₂O₃ is formed from 54 g of aluminium.
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What do your results tell you about the directing effects of the substituents on salicylamide?
The amide group in salicylamide is electron withdrawing, the hydroxyl group on the ring is a highly active, electron donating substituent. The hydroxyl group donates electrons, guided entry iodide to a para position.
What does the word "substituent" signify in chemistry?A substituent is an atom that are substituted for an atom here on parent chain of such a hydrocarbon in both chemistry and biochemistry constituting a moiety of the resulting new molecule.
Alkyl groups: are they substituents?Alkyl groups are substitutes created from alkanes. The names of alkyl groups and unbranched alkane chains are similar. Alkyl groups may branch as well. For instance, the butyl substituent has three constitutional isomers.
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A 0.5 g of naphthalene (C10H8) is burned in a bomb calorimeter containing 650g of water at an initial temperature of 20oC. After the reaction, the final temperature of the water is 26.4oC. The heat capacity of the calorimeter is 420 J/oC. Using these data, calculate the heat of combustion of naphthalene in kJ/mol.
Here, naphthalene is being burned in a water-filled bomb calorimeter.
What is Combustion?
Combustion is a chemical reaction between a fuel and an oxidizer in which heat, light, and other products of combustion are released. The most common type of combustion is the burning of hydrocarbon fuels, such as natural gas or gasoline, to produce carbon dioxide and water vapor as the main products.
Heat of combustion = [mass of water x specific heat capacity x (final temperature - initial temperature)] / (mass of naphthalene)
Heat of combustion = (650 g x 4.185 J/g∙°C x 6.4°C) / (0.5 g)
Heat of combustion = 16,914 J/g
Heat of combustion = 16,914 J/g x (1 mol/128 g)
Heat of combustion = 131.5 kJ/mol
Hence, the heat of combustion is 131.5 kJ/mol.
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Select the proper IUPAC name for the following compound, including the (R) or (S) designation where appropriate. (2R, 3S)-2.3-difluorohexane (2S, 3R)-2, 3-difluorohexane (2R, 3R)-2, 3-difluorohexane (2S, 3S)-2, 3-difluorohexane
The proper IUPAC name for the compound is (2R,3S)-2,3-difluorohexane.
It is determined by following the IUPAC nomenclature rules for organic compounds. The key points for this are:
Parent Chain: The parent chain is a hexane, which is a six-carbon chain.Position of Substituents: A first substituent is a fluoro group that is on the second carbon of the parent chain, and a second substituent is a fluoro group that is on the third carbon of the parent chain. We use the prefix di- to indicate that there are two substituents.Absolute Configuration: The compound is a chiral compound, meaning that it has non-superimposable mirror images. To indicate the absolute configuration, we assign the priority of the substituents based on the atomic number of the atom directly bonded to the carbon atom of the substituent. The prefix (2R,3S) indicates that the substituent on the second carbon is in the R configuration and the substituent on the third carbon is in the S configuration.Final IUPAC Name: The proper IUPAC name of the compound is (2R,3S)-2,3-difluorohexane.Learn more about IUPAC nomenclature here:
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A spirit burner used 1.00 g methanol to raise the temperature of 100.0 g water in a metal can from 28.00C to 58.0C. Calculate the heat of combustion in kJ/mol.
Complete question:
A spirit burner used 1.00 g methanol to raise the temperature of 100.0 g water in a metal can from 28.00C to 58.0C. Calculate the heat of combustion of methanol in kJ/mol.
Answer:
the heat of combustion of the methanol is 402.31 kJ/mol
Explanation:
Given;
mass of water, [tex]m_w[/tex] = 100 g
initial temperature of water, t₁ = 28 ⁰C
final temperature of water, t₂ = 58 ⁰C
specific heat capacity of water = 4.184 J/g⁰C
reacting mass of the methanol, m = 1.00 g
molecular mass of methanol = 32.04 g/mol
number of moles = 1 / 32.04
= 0.0312 mol
Apply the principle of conservation of energy;
[tex]n\Delta H_{methanol} = Q_{water}\\\\n\Delta H_{methanol} = mc\Delta t\\\\n\Delta H_{methanol} = 100 \times 4.184\times (58-28)\\\\n\Delta H_{methanol} = 12,552 \ J\\\\n\Delta H_{methanol} = 12.552 \ kJ\\\\\Delta H_{methanol} = \frac{12.552}{n} \\\\H_{methanol} = \frac{12.552 \ kJ}{0.0312 \ mol} \\\\\Delta H_{methanol} = 402.31 \ kJ/mol[/tex]
Therefore, the heat of combustion of the methanol is 402.31 kJ/mol
What mass of copper(II) sulfate would remain
after removing all the water from 55 g of
CuSO4 · 5 H2O?
Answer in units of g.
According to the concept of molar mass and stoichiometry, the mass of copper(II) sulfate that would remain after removing all the water from 55 g of CuSO₄ · 5 H₂O is 35.18 g.
What is molar mass?Molar mass of a compound or a molecule is defined as the mass of the elements which are present in it.The molar mass is considered to be a bulk quantity not a molecular quantity. It is often an average of the of the masses at many instances.
Molar masses of an element are given as relative atomic masses while that of compounds is the sum of relative atomic masses which are present in the compound.
In copper(II) sulfate , 249.68 g of copper (II) sulfate has 90 g water, thus 55 g of copper (II) sulfate will have 55×90/249.68=19.82 g water, so mass of copper sulfate= 55-19.82=35.18 g copper(II) sulfate.
Thus,35.18 g copper(II) sulfate would remain after removing all the water from 55 g of CuSO₄ · 5 H₂O.
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Instructions: Use the following scenario for questions 2 and 3.
Scenario: The chef places cold water in a pot, places the pot on the stove, and monitors its temperature as time passes. Which of these BEST describes the changes the chef sees occurring at different stages of heating the pot of water?
Before the water begins to boil, thermal energy _____.
remains the same.
increases.
decreases.
Thermal energy increases before the water begins to boil.
Thermal energy is produced when the atoms and molecules in matter vibrate faster due to an increase in temperature. As the average kinetic energy of its particles increases, the thermal energy of the object increases.
After reaching water at its boiling point thermal energy remain same because temperature remain constant after reaching once at boiling point. Thermal energy is directly proportional to temperature. Hence, chef will notice two phenomena during water begins to boil.
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3. Magnesium is a metal.
a. Describe the structure and bonding in magnesium.
b. Why can magnesium conduct electricity when solid?
c. Why is magnesium malleable?
Yes, magnesium is a metallic element and is a member of the alkaline earth metals group.
What is Magnesium?
Magnesium is a chemical element with the symbol Mg and atomic number 12. It is a silvery-white, highly reactive metal that is essential for many biological processes. Magnesium is the eighth most abundant element in the Earth's crust and the fourth most abundant element in the human body.
It is an important component of many enzymes, proteins, and other molecules. Magnesium is found naturally in many foods, including green vegetables, nuts, and grains. Magnesium plays a role in maintaining normal muscle and nerve function, keeping a healthy immune system, regulating blood sugar levels, and helping to form strong bones.
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What is the mole fraction of C2H6O2 in 12. 7 molal aqueous solution ?
The mole fraction of C₂H₆O₂ in 12. 7 molal aqueous solution is 12.7.
What is mole fraction?In chemistry, a mole fraction is the ratio of the moles of one component in a solution or other mixture to the sum of the moles of all the components.
The ratio of the moles of any component to the sum of the moles of all the other components in the mixture is known as the mole fraction. Each gas's partial pressure in a mixture of gases is calculated by multiplying its mole fraction by its total pressure.
The number of solute molecules divided by the sum of the solute molecules and the solvent molecules is known as the mole fraction. This is equal to how many moles of solute there are in a liter of solvent, expressed in molal. If the molal equivalent C₂H₆O₂ is 12.7 this means, all that is in the solution is solute. Hence the mole fraction of C₂H₆O₂ is 12.7.
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Read the following chemical equation.
Cl2 (g) + K+ Br− → K+ Cl− + Br2 (g)
What most likely happens during this reaction? (5 points)
Potassium loses an electron.
Potassium gains an electron.
Bromine loses an electron.
Bromine gains an electron.
In the chemical equation,Cl₂ (g) + K+ Br− → K+ Cl− + Br₂ (g) bromine looses an electron in the reaction.
What is chemical equation?Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.
The first chemical equation was put forth by Jean Beguin in 1615.By making use of chemical equations the direction of reaction ,state of reactants and products can be stated. In the chemical equations even the temperature to be maintained and catalyst can be mentioned.
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How does thermal energy flow between a hot or cold pack and the atmosphere?
A. Both hot and cold packs absorb energy from the atmosphere.
B. Hot packs release energy into the atmosphere and cold packs absorb energy from the atmosphere.
C. Both hot and cold packs release energy from the atmosphere.
D. Hot packs absorb energy from the atmosphere and cold packs release energy into the atmosphere
Thermal energy flow between a hot or cold pack and the atmosphere by the D. Hot packs absorb energy from the atmosphere and cold packs release energy into the atmosphere.
When a hot pack is applied to the skin, the heat energy stored inside the pack is transferred to the skin, by conduction, and the heat energy is absorbed by the skin. Cold packs work in the opposite way, the cold energy stored inside the pack is transferred to the skin and released into the atmosphere.
The heat energy is conducted out of the pack and then radiated out into the atmosphere in the case of a cold pack, and The heat energy is conducted into the pack and then radiated out into the atmosphere in the case of a hot pack.
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If the molar heat of combustion of liquid benzene at constant volume and 300k is -3272KJ. Calculate the heat of combustion at constant pressure at thesame temperature
Answer:
The heat at constant pressure is -3,275.7413 kJ
Explanation:
The combustion equation is 2C₆H₆ (l) + 15O₂ (g) → 12CO₂ (g) + 6H₂O (l)
[tex]\Delta n_g[/tex] = (12 - 15)/2 = -3/2
We have;
[tex]\Delta H = \Delta U + \Delta n_g\cdot R\cdot T[/tex]
Where R and T are constant, and ΔU is given we can write the relationship as follows;
[tex]H = U + \Delta n_g\cdot R\cdot T[/tex]
Where;
H = The heat at constant pressure
U = The heat at constant volume = -3,272 kJ
[tex]\Delta n_g[/tex] = The change in the number of gas molecules per mole
R = The universal gas constant = 8.314 J/(mol·K)
T = The temperature = 300 K
Therefore, we get;
H = -3,272 kJ + (-3/2) mol ×8.314 J/(mol·K) ×300 K) × 1 kJ/(1000 J) = -3,275.7413 kJ
The heat at constant pressure, H = -3,275.7413 kJ.
what is the molarity of a solution prepared by dissolving 30.0g NaCl in enough water to make a 0.300 L solution?
A. 1.82 M NaCl
B. 0.154 M NaCl
C. 0.833 M NaCl
D. 1.71 M NaCl
Answer:
D.) 1.71 M NaCl
Explanation:
Molarity equation: M= n/v
n= moles of solute
v=liters of solution
NaCl= 58.443 g/mol
30g NaCl / 58.443g/mol = 0.5133(this is n)
0.5133 mols/0.300 L=1.71115674 M
Tienen capacidad de fijar enerjgia luminosa utilizando agua y co2 para transformarlo en carbohidratos
Answer:
las plantas
Explanation:
Las plantas son los seres vivos capaces de transformar energía luminosa utilizando agua y dióxido de carbono (CO₂) en energía química en forma de moléculas llamadas carbohidratos. El proceso a través del cual realizan esto se denomina fotosíntesis, y para ello requieren un pigmento de color verde denominado clorofila, el cual es necesario para captar la energía luminosa proveniente del Sol.
What is the total number of atoms present in 5Na,PO.?
Answer:
3.01×10²⁴ atoms
Explanation:
Our compound is the Na₃PO₄
Sodium phosphate.
We assume, we have 5 moles of the mentioned salt.
1 mol of anything contains 6.02×10²³ atoms.
That's the Avogadro's number. The conversion is:
5 mol . 6.02×10²³ atoms /1mol = 3.01×10²⁴ atoms
The "Great Ocean Conveyor Belt" is an ocean current that helps move heat energy around the earth and keeps our atmosphere more liveable. This ocean current is caused by differences in water density. These differences are caused mainly by
A.) Chemical content and surface winds
B.) Salinity and surface winds
C.) Water temperatures and salinity
D.) Water temperatures and geographical formations
I NEED ANSWER ASAP
The ocean current is caused by differences in water density. The difference in the density of water is mainly caused by the temperature and salinity of water.
What is density?Density of a substance is the measure of its mass per unit volume. It describes how closely its particles are packed within a given volume. Density of a substance is dependent on the temperature and pressure also.
The density of water is affected by the temperature and salinity. Water has its maximum density at 4 ° C. The more saline is water, more will be the density. Because, more ions or salts makes water denser.
The density vary with variations in temperature and salinity. This variation causes water currents from the denser areas to the less dense areas. Ocean currents are also affected by the gravity.
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When using a dangerous chemical such as glutaraldehyde, what would the CDC recommend for reducing the risk of illness
Chemical: Wear the proper personal protective equipment (PPE) such as gloves, goggles, and an apron or lab coat.
What is chemical?Chemistry is the scientific study of the composition, structure, properties, and reactions of matter, especially at the atomic and molecular levels.
Use the chemical in a well-ventilated area.
Follow safety instructions and product labeling instructions precisely.
Avoid breathing vapors or mists of the chemical.
Immediately wash hands and exposed skin thoroughly with soap and water after contact with the chemical.
Store the chemical in a secure location away from food, drink, and other materials.
Dispose of the chemical properly.
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The volume of a sample of oxygen is 300.0 mL when the pressure is 1.00 atm and the temperature is 27.0°C. At what temperature is the volume 1.00 L and the pressure 0.500 atm?
How many milliliters of 0.25 M solution of silver nitrate is needed to react with
sodium chloride to produce 7.6 g of silver chloride?
Answer:
To find molarity we must convert grams KCl to moles KCl and mL solution to L: ... EXAMPLE: What mass of potassium chloride would be needed to prepare 250.0 mL of a 0.500 ... EXAMPLE: Silver nitrate solution is added to 25.00 mL of a 0.500 M potassium chloride ... g) 0.655 g of sodium carbonate in 100.0 mL of solution.
Explanation:
What two molecules make up aspartame?
Aspartic acid and phenylalanine are the two amino acids that make up aspartame, along with methanol. When the body processes this third key ingredient, formaldehyde and formic acid are produced.
Materials, Raw Two amino acids, phenylalanine and aspartic acid, as well as methanol, make up aspartame. L-aspartyl-L-phenylalanine methyl ester is its formal chemical name. Proteins are made up of amino acids, which are frequently referred to as the building blocks of proteins. Aspartame has the chemical formula C14H18N2O5. In foods and beverages, aspartame, a synthetic, non-saccharide sweetener that is 200 times sweeter than sucrose, is frequently used as a sugar substitute. The commercial names for it are NutraSweet, Equal, and Canderel.
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What's the difference between a hypothesis and a theory?
Answer:
C. Theories have been confirmed through tests; hypotheses haven't.
Hope this helps!!
Fictitious element X has an average atomic mass of 122. 131 u. Element X has two naturally occuring isotopes. The most abundant isotope has an isotopic mass of 121. 552 u and a relative abundance of 61. 35%. Calculate the isotopic mass of the least abundant isotope
The isotopic mass of the least abundant isotope will be 123.05 u.
Average atomic mass of X = 122.131 u
Assume most abundant isotope = Y and least abundant isotope = Z
Relative abundance (Y) = 61.35%
So,
Z = 100 - 61.35
Z = 38.65 %
Isotopic mass of Y= 121.552 u
Isotopic mass of Z = ?
To calculate the isotopic mass we use the following formula:
Average atomic mass = [(mass Y × percent abundance) + (mass Z × percent abundance)] / 100
put the values
122.131 = [(121.552 × 61.35) + (Z × 38.65)] / 100
12213.1 = (7457.22) + (Z × 38.65)
Z × 38.65 = 12213.1 - 7457.22
Z × 38.65 = 4755.88
Z = 4755.88 / 38.65
Z = 123.05
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1. Explain why during splitting of water not equal volume of oxygen and hydrogen gases were produced?
Answer:
because it has love with
what is the empirical formula for ribose?
Answer:
The empirical formula of ribose (a sugar) is CH2O. In a separate experiment, using a mass spectrometer, the molar mass of ribose was determined to be 150 g/mol.Explanation:
Answer:
The empirical formula of ribose (a sugar) is CH2O. In a separate experiment, using a mass spectrometer, the molar mass of ribose was determined to be 150 g/mol.
Explanation:
how many miles of a gas at 100 c does it take to fill a 1.00 l flask to a pressure of 152kPa
The complete question is as follows: How many moles of a gas at 100 c does it take to fill a 1.00 l flask to a pressure of 152kPa
Answer: There are 0.0489 moles of a gas at [tex]100^{o}C[/tex] is required to fill a 1.00 l flask to a pressure of 152kPa.
Explanation:
Given: Volume = 1.00 L,
Pressure = 152 kPa (1 kPa = 1000 Pa) = 152000 Pa
Convert Pa into atm as follows.
[tex]1 Pa = 9.86 \times 10^{-6} atm\\152000 Pa = 152000 \times \frac{9.86 \times 10^{-6}atm}{1 Pa}\\= 1.5 atm[/tex]
Temperature = [tex]100^{o}C = (100 + 273) K = 373 K[/tex]
Using the ideal gas formula as follows.
PV = nRT
where,
P = pressure
V = volume
n = no. of moles
R = gas constant = 0.0821 L atm/mol K
T = temperature
Substitute the values into above formula as follows.
[tex]PV = nRT\\1.5 atm \times 1.0 L = n \times 0.0821 L atm/mol K \times 373 K\\n = \frac{1.5 atm \times 1.0 L}{0.0821 L atm/mol K \times 373 K}\\n = 0.0489 mol[/tex]
Thus, we can conclude that there are 0.0489 moles of a gas at [tex]100^{o}C[/tex] is required to fill a 1.00 l flask to a pressure of 152kPa.
valence Bond theory predicts that tin will use what hybrid orbitals in Snf5 -1
Answer:
sp3d
Explanation:
The ground state electronic configuration of tin is written as; [Kr] 5s²4d¹⁰5p². Hybridization is a concept used to explain the combination of orbitals of appropriate energy to produce suitable orbitals that could be used for bonding.
In forming the compound Snf5^ -1, we have to hybridize the following orbitals on tin; 5p, 5d and 6s orbitals. This gives us a set of sp3d hybrid hence the answer.
Please help fast, I will give brainliest.
Answer:
The reaction is favorable at all temperatures
Explanation:
Since G = H - TS, -H and +S would result in G = -H -TS, which will always be negative.
A bleaching solution requires 6. 55 g of sodium hypochlorite. How many grams of a 21. 5% by mass solution of sodium hypochlorite should be used
A bleaching solution requires 6. 55 g of sodium hypochlorite. 30.47 grams of a 21. 5% by mass solution of sodium hypochlorite should be used
Mass of sodium hypochlorite = 6.55 g
percent composition = 21. 5%
This indicates that there are 21.5 grams of sodium hypochlorite present in every one hundred grams of solution.
Now calculate the number of grams of solution for 6.55 g of solution.
(6.55 g x 100) / 21.5 g = 30.47 g
Therefore, you will need 30.47 grams of a sodium hypochlorite solution that has a mass concentration of 21.5% in order to obtain 6.55 grams of sodium hypochlorite.
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Freddy mixes a solid chemical with a liquid chemical and generates a chemical reaction. What can be said about any mixture of chemicals he used
Many of these, including cheese, gelatin, and various inks, are commonplace. Like the other classes, mixtures of solids and liquids may be separated in many ways.
science has been actively involved in the pursuit of this goal since it is crucial for a variety of liquids. When two or more distinct substances physically join, a mixture is produced that can be dispersed back into its constituent parts. a bowl of various candies, a pile of various leaves, steel, and sugar syrup A gelatin is any two or more different types of particles together. These particles are physically bound together rather than reacting chemically with one another. Two or more reactants are changed into one or more separate products during a chemical reaction. Alternately, we might assume that a chemical reaction rearranges the atoms of the reactants to create new products.
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what causes planet Earth to have season? and in the summer which way would the Earth be facing?