Question 1

What is the concentration of O₂(g)in water at 25°C exposed to a partial pressure of oxygen of 325 mmHg? The Henry's law constant for oxygen gas at 25°C is 1.3 * 10^-3 mol/L·atm.

Accepted Answer

The answer of What is the concentration of O₂(g)in water...

Question 2

Maple syrup is mostly a solution of sucrose in water. Calculate the molality of the syrup if a sample freezes at -0.50°C, assuming the solute is pure sucrose. [For water, K_f is 1.86°C/m.]

Accepted Answer

The answer of Maple syrup is mostly a solution of...

Question 3

A solution is prepared by adding 40.3 g of Mg(NO₃)₂ to 127 g of water. Calculate the mole fraction and molality of magnesium nitrate in this solution.

Accepted Answer

The answer of A solution is prepared by adding 40.3...

Question 4

A solution that contains 55.0 g of ascorbic acid (VitaminC) in 250. g of water freezes at -2.34°C. Calculate the molar mass (in units of g/mol) of the solute. Kf of water is 1.86°C/m.

Accepted Answer

A)  1.26 
B)  10.9 
C)  43.6 
D)  175 
E)  277

Question 5

During osmosis

Accepted Answer

A) pure solvent diffuses through a membrane but solutes do not. 
B) pure solutes diffuse through a membrane but solvent does not. 
C) pure solvent and a solution both diffuse at the same time through a membrane. 
D) gases diffuse through a membrane into a solution and build up pressure.

Question 6

In which of the following solvents would you expect KBr to be most soluble?

Accepted Answer

A) C6H14 (hexane) 
B) CH3CH2OH (ethanol) 
C) C6H6 (benzene) 
D) CCl4 (carbon tetrachloride) 
E) C6H12 (cyclohexane)

Question 7

What is the boiling point of an aqueous solution of a nonelectrolyte that has an osmotic pressure of 10.50 atm at 25°C? Kb of water is 0.52°C/m. Assume the density of the solution is the same as that of pure water.

Accepted Answer

A) 0.22°C 
B) 0.429°C 
C) 100.43°C 
D) 99.78°C 
E) 100.22°C

Question 8

Pure benzene, C6H6, freezes at 5.5° and boils at 80.1°C. What is the boiling point of a solution consisting of cyclohexane (C6H12)dissolved in benzene if the freezing point of this solution is 0.0°C? (For benzene, Kf = 5.12 °C/m, Kb = 2.53 °C/m; for cyclohexane, Kf = 20.0 °C/m, Kb = 2.79°C/m)

Accepted Answer

A) 82.8°C 
B) 91.2°C 
C) 80.9°C 
D) 77.4°C 
E) 83.1°C

Question 9

When 12.1 g of the sugar sucrose (a nonelectrolyte)are dissolved in exactly 800 g of water, the solution has a freezing point of -0.082°C. What is the molar mass of sucrose? Kf of water is 1.86°C/m.

Accepted Answer

A) 426 g 
B) 99.2 g 
C) 178 g 
D) 266 g 
E) 343 g

Question 10

What is the freezing point of an aqueous solution of a nonvolatile solute that has a boiling point of 102.5°C? For water Kf = 1.86°C/m and Kb = 0.52°C/m.

Accepted Answer

A) -8.94°C 
B) -366°C 
C) -0.99°C 
D) 0.99°C 
E) 8.94°C

Question 11

Calculate the molality of a 15.0% by mass solution of MgCl2 in H2O. The density of this solution is 1.127 g/mL.

Accepted Answer

A) 0.157 m 
B) 11.8 m 
C) 1.86 m 
D) 0.0134 m 
E) 1.58 m

Question 12

The solubility of gases in water usually decreases with

Accepted Answer

A) increasing pressure. 
B) increasing temperature. 
C) decreasing temperature.

Question 13

Explain the following, on the basis of osmosis or osmotic pressure: Drinking salt water actually dehydrates our tissues.

Accepted Answer

The answer of Explain the following, on the basis of...

Question 14

Calculate the freezing point of a solution made from 22.0 g of octane (C8H18)dissolved in 148.0 g of benzene. Benzene freezes at 5.50°C and its Kf value is 5.12°C/m.

Accepted Answer

A) -1.16°C 
B) 0.98°C 
C) 6.66°C 
D) 12.2°C 
E) 5.49°C

Question 15

The solubility of gases in water always decreases with increasing temperature.

Accepted Answer

A) True 
 B)False

Question 16

What is the osmotic pressure of a solution that contains 13.7 g of propyl alcohol (C3H7OH)dissolved in enough water to make 500. mL of solution at 27°C?

Accepted Answer

A) 0.014 atm 
B) 0.037 atm 
C) 0.456 atm 
D) 0.01 atm 
E) 11.2 atm

Question 17

When 20.0 grams of an unknown compound are dissolved in 500. grams of benzene, the freezing point of the resulting solution is 3.77°C. The freezing point of pure benzene is 5.444°C, and the K_f for benzene is 5.12°C/m. What is the molar mass of the unknown compound?

Accepted Answer

The answer of When 20.0 grams of an unknown compound...

Question 18

When 24.0 g of glucose (a nonelectrolyte)are dissolved in 500. g of water, the solution has a freezing point of -0.47°C. What is the molar mass of glucose? Kf of water is 1.86°C/m.

Accepted Answer

A) 41.9 g 
B) 47.5 g 
C) 54.9 g 
D) 178 g 
E) 190. g

Question 19

What is the molar mass of toluene if 0.85 g of toluene depresses the freezing point of 100. g of benzene by 0.47°C? Kf of benzene is 5.12°C/m.

Accepted Answer

A) 92.6 g/mol 
B) 78.0 g/mol 
C) 10.7 g/mol 
D) 81.8 g/mol 
E) 927 g/mol

Question 20

What volume of ethanol (density = 0.7893 g/cm3)should be added to 450. mL of water in order to have a solution that freezes at -15.0°C? (For water, Kf = 1.86 °C/m.)

Accepted Answer

A) 371 mL 
B) 470 mL 
C) 212 mL 
D) 132 mL 
E) 167 mL

Exam 13: Physical Properties of Solutions

What is the concentration of O₂(g)in water at 25°C exposed to a partial pressure of oxygen of 325 mmHg? The Henry's law constant for oxygen gas at 25°C is 1.3 * 10^-3 mol/L·atm.

Maple syrup is mostly a solution of sucrose in water. Calculate the molality of the syrup if a sample freezes at -0.50°C, assuming the solute is pure sucrose. [For water, K_f is 1.86°C/m.]

A solution is prepared by adding 40.3 g of Mg(NO₃)₂ to 127 g of water. Calculate the mole fraction and molality of magnesium nitrate in this solution.

A solution that contains 55.0 g of ascorbic acid (VitaminC) in 250. g of water freezes at -2.34°C. Calculate the molar mass (in units of g/mol) of the solute. K_f of water is 1.86°C/m.

During osmosis

In which of the following solvents would you expect KBr to be most soluble?

What is the boiling point of an aqueous solution of a nonelectrolyte that has an osmotic pressure of 10.50 atm at 25°C? K_b of water is 0.52°C/m. Assume the density of the solution is the same as that of pure water.

When 12.1 g of the sugar sucrose (a nonelectrolyte) are dissolved in exactly 800 g of water, the solution has a freezing point of -0.082°C. What is the molar mass of sucrose? K_f of water is 1.86°C/m.

What is the freezing point of an aqueous solution of a nonvolatile solute that has a boiling point of 102.5°C? For water K_f = 1.86°C/m and K_b = 0.52°C/m.

Calculate the molality of a 15.0% by mass solution of MgCl₂ in H₂O. The density of this solution is 1.127 g/mL.

The solubility of gases in water usually decreases with

Explain the following, on the basis of osmosis or osmotic pressure: Drinking salt water actually dehydrates our tissues.

Calculate the freezing point of a solution made from 22.0 g of octane (C₈H₁₈) dissolved in 148.0 g of benzene. Benzene freezes at 5.50°C and its K_f value is 5.12°C/m.

The solubility of gases in water always decreases with increasing temperature.

What is the osmotic pressure of a solution that contains 13.7 g of propyl alcohol (C₃H₇OH) dissolved in enough water to make 500. mL of solution at 27°C?

When 20.0 grams of an unknown compound are dissolved in 500. grams of benzene, the freezing point of the resulting solution is 3.77°C. The freezing point of pure benzene is 5.444°C, and the K_f for benzene is 5.12°C/m. What is the molar mass of the unknown compound?

When 24.0 g of glucose (a nonelectrolyte) are dissolved in 500. g of water, the solution has a freezing point of -0.47°C. What is the molar mass of glucose? K_f of water is 1.86°C/m.

What is the molar mass of toluene if 0.85 g of toluene depresses the freezing point of 100. g of benzene by 0.47°C? K_f of benzene is 5.12°C/m.

What volume of ethanol (density = 0.7893 g/cm³) should be added to 450. mL of water in order to have a solution that freezes at -15.0°C? (For water, K_f = 1.86 °C/m.)

Exam 13: Physical Properties of Solutions

What is the concentration of O2(g)in water at 25°C exposed to a partial pressure of oxygen of 325 mmHg? The Henry's law constant for oxygen gas at 25°C is 1.3 * 10-3 mol/L·atm.

Maple syrup is mostly a solution of sucrose in water. Calculate the molality of the syrup if a sample freezes at -0.50°C, assuming the solute is pure sucrose. [For water, Kf is 1.86°C/m.]

A solution is prepared by adding 40.3 g of Mg(NO3)2 to 127 g of water. Calculate the mole fraction and molality of magnesium nitrate in this solution.

A solution that contains 55.0 g of ascorbic acid (VitaminC) in 250. g of water freezes at -2.34°C. Calculate the molar mass (in units of g/mol) of the solute. Kf of water is 1.86°C/m.

During osmosis

In which of the following solvents would you expect KBr to be most soluble?

What is the boiling point of an aqueous solution of a nonelectrolyte that has an osmotic pressure of 10.50 atm at 25°C? Kb of water is 0.52°C/m. Assume the density of the solution is the same as that of pure water.

When 12.1 g of the sugar sucrose (a nonelectrolyte) are dissolved in exactly 800 g of water, the solution has a freezing point of -0.082°C. What is the molar mass of sucrose? Kf of water is 1.86°C/m.

What is the freezing point of an aqueous solution of a nonvolatile solute that has a boiling point of 102.5°C? For water Kf = 1.86°C/m and Kb = 0.52°C/m.

Calculate the molality of a 15.0% by mass solution of MgCl2 in H2O. The density of this solution is 1.127 g/mL.

The solubility of gases in water usually decreases with

Explain the following, on the basis of osmosis or osmotic pressure: Drinking salt water actually dehydrates our tissues.

Calculate the freezing point of a solution made from 22.0 g of octane (C8H18) dissolved in 148.0 g of benzene. Benzene freezes at 5.50°C and its Kf value is 5.12°C/m.

The solubility of gases in water always decreases with increasing temperature.

What is the osmotic pressure of a solution that contains 13.7 g of propyl alcohol (C3H7OH) dissolved in enough water to make 500. mL of solution at 27°C?

When 20.0 grams of an unknown compound are dissolved in 500. grams of benzene, the freezing point of the resulting solution is 3.77°C. The freezing point of pure benzene is 5.444°C, and the Kf for benzene is 5.12°C/m. What is the molar mass of the unknown compound?

When 24.0 g of glucose (a nonelectrolyte) are dissolved in 500. g of water, the solution has a freezing point of -0.47°C. What is the molar mass of glucose? Kf of water is 1.86°C/m.

What is the molar mass of toluene if 0.85 g of toluene depresses the freezing point of 100. g of benzene by 0.47°C? Kf of benzene is 5.12°C/m.

What volume of ethanol (density = 0.7893 g/cm3) should be added to 450. mL of water in order to have a solution that freezes at -15.0°C? (For water, Kf = 1.86 °C/m.)

What is the concentration of O₂(g)in water at 25°C exposed to a partial pressure of oxygen of 325 mmHg? The Henry's law constant for oxygen gas at 25°C is 1.3 * 10^-3 mol/L·atm.

Maple syrup is mostly a solution of sucrose in water. Calculate the molality of the syrup if a sample freezes at -0.50°C, assuming the solute is pure sucrose. [For water, K_f is 1.86°C/m.]

A solution is prepared by adding 40.3 g of Mg(NO₃)₂ to 127 g of water. Calculate the mole fraction and molality of magnesium nitrate in this solution.

A solution that contains 55.0 g of ascorbic acid (VitaminC) in 250. g of water freezes at -2.34°C. Calculate the molar mass (in units of g/mol) of the solute. K_f of water is 1.86°C/m.

What is the boiling point of an aqueous solution of a nonelectrolyte that has an osmotic pressure of 10.50 atm at 25°C? K_b of water is 0.52°C/m. Assume the density of the solution is the same as that of pure water.

When 12.1 g of the sugar sucrose (a nonelectrolyte) are dissolved in exactly 800 g of water, the solution has a freezing point of -0.082°C. What is the molar mass of sucrose? K_f of water is 1.86°C/m.

What is the freezing point of an aqueous solution of a nonvolatile solute that has a boiling point of 102.5°C? For water K_f = 1.86°C/m and K_b = 0.52°C/m.

Calculate the molality of a 15.0% by mass solution of MgCl₂ in H₂O. The density of this solution is 1.127 g/mL.

Calculate the freezing point of a solution made from 22.0 g of octane (C₈H₁₈) dissolved in 148.0 g of benzene. Benzene freezes at 5.50°C and its K_f value is 5.12°C/m.

What is the osmotic pressure of a solution that contains 13.7 g of propyl alcohol (C₃H₇OH) dissolved in enough water to make 500. mL of solution at 27°C?

When 20.0 grams of an unknown compound are dissolved in 500. grams of benzene, the freezing point of the resulting solution is 3.77°C. The freezing point of pure benzene is 5.444°C, and the K_f for benzene is 5.12°C/m. What is the molar mass of the unknown compound?

When 24.0 g of glucose (a nonelectrolyte) are dissolved in 500. g of water, the solution has a freezing point of -0.47°C. What is the molar mass of glucose? K_f of water is 1.86°C/m.

What is the molar mass of toluene if 0.85 g of toluene depresses the freezing point of 100. g of benzene by 0.47°C? K_f of benzene is 5.12°C/m.

What volume of ethanol (density = 0.7893 g/cm³) should be added to 450. mL of water in order to have a solution that freezes at -15.0°C? (For water, K_f = 1.86 °C/m.)