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likoan [24]
3 years ago
12

Choose the aqueous solution with the highest vapor pressure. These are all solutions of nonvolatile solutes and you should assum

e ideal van't Hoff factors where applicable.0.50 m C5H12O50.50 m C11H24O110.50 m C2H6O20.50 m C4H10O4They all have about the same vapor pressure.
Chemistry
1 answer:
VashaNatasha [74]3 years ago
7 0

Answer:

They all have about the same vapor pressure.

Explanation:

The elevation of the vapor pressure is related to the elevation of the boiling point: for higher vapor pressure, the liquid will boils at a low temperature.

When a nonvolatile compound is added to the liquid, the boiling temperature increases, in an effect called ebullioscopy, and that difference of temperature can be calculated by:

ΔT = K*W*i

Where K is a constant for the liquid, W is the molality, and i is the van't Hoff factor, which depends on the dissociation of the compound.

i = dissociated particles/total particles

For the molecules compounds given, the ideal van't Hoff factor is 1.

The molality can be calculated by:

W = n1/m2

Where n1 is the number of moles of the solute and m2 is the mass of the solvent. In this case, all the solutes have the same number of moles for the same volume of the solution because they have the same concentration, so the change in temperature is the same for all of them.

Then, they all have about the same vapor pressure.

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The correct answer is B).

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You add 4.7 gg iron to 27.10 mL of water and observe that the volume of iron and water together is 27.70 mLmL . Calculate the de
sattari [20]

Answer : The density of iron is, 7.8 g/mL

Explanation : Given,

Mass of iron = 4.7 g

Volume of water = 27.10 mL

Volume of water and iron = 27.70 mL

First we have to calculate the volume of iron.

Volume of iron = Volume of water and iron - Volume of water

Volume of iron = 27.70 mL - 27.10 mL

Volume of iron = 0.6 mL

Now we have to calculate the density of iron.

\text{Density of iron}=\frac{\text{Mass of iron}}{\text{Volume of iron}}

Now put all the given values in this expression, we get:

\text{Density of iron}=\frac{4.7g}{0.6mL}

\text{Density of iron}=7.8g/mL

Thus, the density of iron is, 7.8 g/mL

5 0
3 years ago
Because rusting is a spontaneous process under standard conditions, which of the following is a correct conclusion about the pro
lawyer [7]

The correct conclusion about the process is that "DeltaG" is negative and the product of temperature and "DeltaS" is greater than "DeltaH". That is option C

Spontaneous reaction are natural reactions that occurs without depending on energy from external sources.

A typical example of a spontaneous reaction is the rusting of iron.

To know if a reaction is spontaneous, second law of thermodynamics is used through Gibbs free energy.

At standard conditions ( constant temperature and pressure), Gibbs free energy(G) is equal to enthalpy change(ΔH) minus product of temperature(T) and the entropy change (ΔS) of the system.

That is, ΔG =ΔH −TΔS,

Entropy (S) is a measure of the degree of disorderliness of a system.

Enthalpy (H) is the heat of the reaction which is positive when heat is given out or negative when heat is absorbed.

From the formula, when ∆G is less than 0, the reaction is said to be spontaneous.

For ∆G to be less than 0, this means ∆H(DeltaH) is less than 0 and T∆ S( product of temperature and "DeltaS") is greater than 0 to achieve a negative value for ∆G(DeltaG)

Therefore, DeltaG" is negative and the product of temperature and "DeltaS" is greater than "DeltaH".

Learn more about spontaneous reaction here:

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2 years ago
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ella [17]

Answer:

protones

Explanation:

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3 years ago
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A gas is collected at 20.0 °C and 725.0 mm Hg. When the temperature is
krek1111 [17]

Answer:

676mmHg

Explanation:

Using the formula;

P1/T1 = P2/T2

Where;

P1 = initial pressure (mmHg)

P2 = final pressure (mmHg)

T1 = initial temperature (K)

T2 = final temperature (K)

According to the information provided in this question;

P1 = 725.0mmHg

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T1 = 20°C = 20 + 273 = 293K

T2 = 0°C = 0 + 273 = 273K

Using P1/T1 = P2/T2

725/293 = P2/273

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725 × 273 = 293 × P2

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P2 = 197925 ÷ 293

P2 = 676mmHg.

The resulting pressure is 676mmHg

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