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Answer:

0.0800 (on CK-12)

Explanation:

Given grams of CuCl2/molar mass of CuCl2
27.2g/134.45g=0.2023...

Next,
0.2023mol/2.50L = 0.0800

The molality of the copper(II) chloride (CuCl₂) solution is 0.081 mol/kg

Molality is a measure of the number of moles of solute in a solution corresponding to 1 kg or 1000 g of solvent

First, we will determine the number of moles of CuCl₂ present

Using the formula,

[tex]Number\ of\ moles = \frac{Mass}{Molar\ mass}[/tex]

Mass of CuCl₂ = 27.2 g

Molar mass of CuCl₂ = 134.45 g/mol

∴ Number of moles of CuCl₂ present = [tex]\frac{27.2}{134.45 }[/tex]

Number of moles of CuCl₂ present = 0.2023 mole

Now, for the molality of the solution

Volume of solvent (water) = 2.50 L

Since the density of water = 1kg/L

Then, mass of the solvent (water) = 2.50 kg

[tex]Molality = \frac{Number\ of\ moles}{Mass\ of\ solvent}[/tex]

∴ Molality of the solution = [tex]\frac{0.2023}{2.50}[/tex]

Molality of the solution = 0.081 mol/kg

Hence, the molality of the solution is 0.081 mol/kg

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#SPJ2

Answer:

No, because the moon takes about 27 days to fully orbit which means that 3 weeks would not be enough to see all of the moon's phases, but if you think that you don't need 27 days due to the fact that some of the days there may not be a phase change then that is completely up to you.

Explanation:

Hope this helps:)...if not then sorry for wasting your time and may God bless you:)

Answer

no. of moles =

[tex] \frac{mass \: {g} \: }{ \: molecular \: wight} [/tex]

so, mass (g)= no. of moles × molecular wight

Explanation:

Li molecular wight equal to 6.941

mass (g)=3.29×104 mol ×6.941 =2374.93g of lithium

For the partial pressure in mmHg of hydrogen gas  is mathematically given as

partial p = 257.81mmHg

Generally, the equation for the partial pressure is mathematically given as

partial p = mole of H2/total moles x total pressure

H2 =0.00206/2

H2 = 0.00103

O2 = 0.0811/32

O2 = 0.00253

H20 = 0.0151/18

H2O = 0.000839

total moles = 0.00103+0.000839+0.00253

total moles = 0.00439

therefore

partial p = 0.00103/0.00439 x 1101.1

partial p = 257.81mmHg

In conclusion, the partial pressure in mmHg of hydrogen gas is

partial p = 257.81mmHg

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Answer:

The answer is  Muscle, Stomach, chews or sucks.

Explanation:

These are the roles they play.

Answer:

be specific it's too little information

Answer:

The answer is d.

"It has no definite shape or volume and will expand indefinitely."

Explanation:

Gaseous substances contain molecules that seriously want to move. These molecules take up any space that is free to the point where the substance will dissapate and lose its concentration. Aka, expand indefinitely.

Answer:

The onion cells release compounds into the air, and enzymes must follow up to alter amino acids into other compounds, causing irritation in the eye. To prevent, "crying" from an onion, try peeling the onion, then chilling the onion in the fridge for about 30 minutes. Otherwise, you can buy tearless onions.

Answer:

With high electronegativity differences

Explanation:

For exam ple

The crystal field theory accounts for the color of transition metal ions on the bases of splitting of d orbitals. The energy of the crystal-field splitting is 235kJ/mol.

The crystal field theory accounts for the color of transition metal ions on the bases of splitting of d orbitals. The energy of the spliting is obtained from the wavelength in the visible spectrum.

Now the wavelength is  509 nm hence the energy is obtained from;

E = 6.6 * 10^-34 * 3 * 10^8/509 * 10^-9 * 6.02 * 10^23/1 mol * 1/1000 kJ

= 235kJ/mol

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The scenario whereby the initial pressure is equal to the final pressure is : ( A ) A balloon filled with air is heated from 300k to 600k, causing it to expand and double in size.

Gay Lussac's law states that at constant pressure, the volume of gas is directly proportional to the change in temperature. i.e. V ∝ T. From scenario 1 the change in temperature from 300 K to 600 K shows a 100% increase in temperature which corresponds with the expansion and size doubling of the volume of gas.

Hence we can conclude that The scenario whereby the initial pressure is equal to the final pressure is : ( A ) A balloon filled with air is heated from 300k to 600k, causing it to expand and double in size.

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Answer:

alpha emission

Explanation:

Answer:

The main difference between isopropyl alcohol and rubbing alcohol is the concentration. The concentration of isopropyl alcohol is 100%, while the concentration of rubbing alcohol is less because of the addition of water. Otherwise, the two liquids have similar properties.

Explanation:

Hope this helps

Answer:

an energy source

Explanation:

Answer:

Cobalt (Co)

Explanation:

it has 27 protons and atomic mass of 60 in Cobalt 60 isotope

A converging lens made from a transparent plastic bottle filled with water is used to enable Pak Dollah read the newspaper.

Long-sightedness is an eye effect in which objects are not able to focus on the retina but behind the retina, therefore, near objects are not clearly seen except they are placed far away.

To correct long-sightedness, a suitable converging lens is used to bring the image to focus on the retina.

To construct a converging lens for Pak Dollah, the transparent plastic bottle is filled with water to serve as a converging lens and Pal Dollah will read through it.

Therefore, a converging lens made from a transparent plastic bottle filled with water is used to enable Pak Dollah read the newspaper.

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The substance which has H⁺ concentration but is still considered an acid is milk.

Acidity of any substance will be calculated by using the pH scale and pH is define as:

pH = -log[H⁺]

Among the given substances pH of them are in range of:

pH scale ranges from 0 to 14, where 0 to 6.9 shows the acidity, 7 shows the neutrality and from 7.1 to 14 shows the basicity of the solution. From the given pH values it is clear that lye is highly basic and gastric fluid is highly acidic. And blood has slight basic nature and due to the presence of lactic acid milk has very low concentration of H⁺ ions and considered as acid.

Hence milk is the correct answer.

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Answer:

1.37cm

Explanation:

It's less than 1.4cm but more than 1.3cm. It's also more than 1.35cm so I guess the best answer would be 1.37cm or round up to 1.4cm

Adam observed properties of four different waves and the sound quality of all of the waves can be compared.

Waves is the propagation system of any matter in the upside and downside direction from the mean position.

Quality of sound waves will be measured by using the decibel unit which gives idea about the intensity of the sound in terms of loudness. And intensity of the sound waves is also be calculated by using the frequency in the given table frequency and decibel unit of four waves are given.

So we are able to compare the sound quality of all given waves and image of table is attached below.

Hence the sound quality of all of the waves can be compared.

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Answer:

The Answer is B

Explanation:

Took it on Edge

Answer:

Ox2 Cu03

Explanation:All from plato definetley correct

Answer:

+2

Explanation:

10 e   will 'balance '   10 p    then there is two + charges leftover

Explanation:

From PV = nRT

9.67V = 12(0.0821)(467.5)

V = 47.63 L

Answer:

The correct answer is C. 6 Liters

Explanation:

You have to multiply the 2 liters by the atmospheres (which is 3) you get 6. six liters is the new volume.

Empirical formula mass

Molecular fornula mass:-180g/mol

Molecular formula:-

Answer:

Because ions in an aqueous solution are free to move independently from each other. the net flow of cations toward a negative or positive electrode results in a flow of charge, which is an electrical current.

Explanation:

Answer:

Trigonal planar

Explanation:

Formaldehyde is a great example of this shape.

The central Carbon has a double bond with an Oxygen and two single bonds with Hydrogens

Based on the chemical equation, to balance the given equation we should use 2 as a coefficients of HCl on reacatnt side of the reaction.

Balanced chemical equations are those equation in which each entities are present in same amount on reactant side as well as on the product side of the chemical reaction.

Given chemical reaction is:

Zn + HCl → ZnCl₂ + H₂

In the above reaction equation  is not balanced as number of chlorine and hydrogen atoms are not equal on both sides, so balanced equation will be:

Zn + 2HCl → ZnCl₂ + H₂

Hence we add 2 as a coefficient of HCl to balance the equation.

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Answer:

1 2 1 1

Explanation:

Explanation:

Sol. 450 ml there is LiCl 200 g

Sol. 1000 ml there is LiCl 200/450×1000

= 444.44 g

Molar = g/molar mass = 444.44/42.394 = 10.48 M

[tex]\text{pH} = -\log[H^{+}]\\\\\implies \log[H^{+}] = -\text{pH}\\\\\implies [H^{+}] = 10^{-\text{pH}}}\\\\\implies [H^{+}] =10^{-3.75}=0.00017~M[/tex]