Question 1

If the density of a solution is less than 1.0 g/mL,its molarity will be greater than its molality.

Accepted Answer

The density of a solution is not always directly proportional to its molarity or molality. The relationship between density, molarity, and molality depends on the specific solute and solvent involved in the solution. Therefore, the statement is not always true and can be false in some cases.

Question 2

Octane and nonane are liquids which are components of gasoline.Their vapor pressures at 25°C are 13.9 torr and 4.7 torr,respectively.What is the vapor pressure of a mixture consisting of 1 mole of each of these compounds?

Accepted Answer

The answer of Octane and nonane are liquids which are...

Question 3

A 7.112 M solution of sulfuric acid (H₂SO₄)in water has a density of 1.395 g/mL.What is its molality?

Accepted Answer

The answer of A 7.112 M solution of sulfuric acid...

Question 4

If the shell of a raw egg is carefully dissolved away,and the egg in its flexible membrane is then placed in distilled water,the egg's volume will expand.Explain.

Accepted Answer

The answer of If the shell of a raw egg...

Question 5

The solubility of gases in water increases with increase in the pressure of the gas.

Accepted Answer

According to Henry's law, the solubility of gases in a liquid is directly proportional to the pressure of the gas above the liquid. Therefore, as the pressure of the gas increases, the solubility of the gas in the liquid (in this case, water) will also increase.

Question 6

Predict the van't Hoff factor (i)for each of the following solutes: a.CaCl₂ b.Fe₂(SO₄)₃ c.NH₄Cl

Accepted Answer

The answer of Predict the van't Hoff factor (i)for each...

Question 7

Heats of solution may be either positive or negative.

Accepted Answer

Heats of solution are the amount of energy gained or lost when a solute dissolves in a solvent. If the process releases energy, the heat of solution is negative, and if the process absorbs energy, the heat of solution is positive.

Question 8

Heats of hydration may be either positive or negative.

Accepted Answer

The answer of Heats of hydration may be either positive...

Question 9

In general,water is a good solvent for both polar and non-polar compounds.

Accepted Answer

Water is a good solvent for polar compounds due to its polarity, but it is not effective at dissolving nonpolar compounds.

Question 10

A 0.137 m solution of sodium ferrocyanide (NaFe(CN)₆.10H₂O)in water has a freezing point depression of 0.755°C.Calculate the van't Hoff factor (i)under these conditions.(K_f = 1.86°C/m)

Accepted Answer

The answer of A 0.137 m solution of sodium ferrocyanide...

Question 11

Raoult's Law relates the vapor pressure of a solvent above a solution to the mole fraction of the solvent and the vapor pressure of the pure solvent.

Accepted Answer

Raoult's Law is a well-established law in physical chemistry that relates the vapor pressure of a solvent in a mixture to its mole fraction. The law states that the partial vapor pressure of a solvent above a solution is equal to the product of its mole fraction in the solution and its vapor pressure when it is pure. This law is valid for ideal solutions where the interaction between the components is negligible.

Question 12

The heat of solution is the total enthalpy change when a solution is formed from the separated solute and solvent.

Accepted Answer

The statement is true.

Question 13

Ideal solutions do not conform to Raoult's Law.

Accepted Answer

Ideal solutions conform to Raoult's Law across the entire range of concentrations, as Raoult's Law describes how the vapor pressure of an ideal solution is dependent on the vapor pressure of each chemical component and the mole fraction of the component present in the mixture.

Quiz 13: The Properties of Solutions