Question 1

The mole fraction of potassium nitrate in an aqueous solution is 0.0194. The solution's density is 1.0627 g/mL. Calculate the molarity of the solution.

Accepted Answer

A)  0.0194 M 
B)  0.981 M 
C)  1.05 M 
D)  1.96 M 
E)  19.4 M

Question 2

Barbiturates are synthetic drugs used as sedatives and hypnotics. Barbital (  = 184.2 g/mol) is one of the simplest of these drugs. What is the boiling point of a solution prepared by dissolving 42.5 g of barbital in 825 g of acetic acid? Kb = 3.07°C/m; boiling point of pure acetic acid = 117.9°C

Accepted Answer

A)  117.0°C 
B)  117.7°C 
C)  118.1°C 
D)  118.8°C 
E)  >120°C

Question 3

What volume of concentrated (14.7 M) phosphoric acid is needed to prepare 25.0 L of 3.0 M H3PO4?

Accepted Answer

A)  0.20 L 
B)  0.57 L 
C)  1.8 L 
D)  3.6 L 
E)  5.1 L

Question 4

Which of the following aqueous solutions should demonstrate the most non-ideal behavior?

Accepted Answer

A)  0.1 M NaI 
B)  0.2 M CuSO4 
C)  0.5 M KBr 
D)  2.0 M CuCl2 
E)  2.0 M CsCl

Question 5

A solution of sucrose (sugar) in water is in equilibrium with solid sucrose. If more solid sucrose is now added, with stirring,

Accepted Answer

A)  the concentration of the solution will increase. 
B)  the concentration of the solution will decrease. 
C)  the concentration of the solution will remain the same. 
D)  the volume of solution will increase. 
E)  a supersaturated solution will be produced.

Question 6

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 7

Soda drinks bubble when the bottle is opened because

Accepted Answer

A)  the temperature of the soda increases. 
B)  exposure to atmospheric pressure squeezes the carbon dioxide from solution. 
C)  the partial pressure of carbon dioxide above the solution is reduced. 
D)  atmospheric nitrogen molecules displace carbon dioxide molecules. 
E)  the Henry's law constant changes due to the change in pressure.

Question 8

Aqueous ammonia is commercially available in a solution that is 28% (w/w) ammonia. What is the mole fraction of ammonia in such a solution?

Accepted Answer

A)  0.017 
B)  0.023 
C)  0.012 
D)  0.24 
E)  0.29

Question 9

Potassium fluoride is used for frosting glass. Calculate the molarity of a solution prepared by dissolving 78.6 g of KF in enough water to produce 225 mL of solution.

Accepted Answer

A)  0.304 M 
B)  0.349 M 
C)  1.35 M 
D)  3.29 M 
E)  6.01 M

Question 10

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

Accepted Answer

A) True 
 B)False

Question 11

Potassium hydrogen phosphate is used in the preparation of non-dairy powdered creamers. Calculate the molarity of a solution prepared by dissolving 238 g of K2HPO4 in enough water to produce 275 mL of solution.

Accepted Answer

A)  0.732 M 
B)  0.865 M 
C)  2.66 M 
D)  4.97 M 
E)  none of the above

Question 12

Predict the ideal 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 ideal van't Hoff factor (i)...

Question 13

A solution of ethanol (C2H6O) in water is sometimes used as a disinfectant. 1.00 L of this solution contains 553 g of ethanol and 335 g of water. What is the mole fraction of ethanol in this solution?

Accepted Answer

A)  0.377 
B)  0.392 
C)  0.553 
D)  0.608 
E)  0.623

Question 14

A 0.137 m solution of sodium ferrocyanide (Na₄Fe(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 15

Which of the following pairs of ions is arranged so that the ion with the smaller charge density is listed first?

Accepted Answer

A)  K+, Rb+ 
B)  Cl-, K+ 
C)  Cl-, Br- 
D)  Ca2+, Ba2+ 
E)  None of the above pairs are arranged in this way.

Question 16

Calculate the freezing point of a solution made by dissolving 3.50 g of potassium chloride (  = 74.55 g/mol) in 100.0 g of water. Assume ideal behavior for the solution; Kf = 1.86°C/m.

Accepted Answer

A)  -1.7°C 
B)  -0.9°C 
C)  0.0°C 
D)  0.9°C 
E)  1.7°C

Question 17

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 18

Children under the age of six with more than 0.10 ppm of lead in their blood can suffer a reduction in I.Q. or have behavior problems. What is the molality of a solution which contains 0.10 ppm of lead?

Accepted Answer

A)  4.8 × 10-10 m 
B)  4.8 × 10-7 m 
C)  4.8 × 10-4 m 
D)  4.8 × 10-1 m 
E)  none of the above

Question 19

Isoamyl salicylate (  = 208.25 g/mol) has a pleasant aroma and is used in perfumes and soaps. Which of the following combinations gives a 0.75 m solution of isoamyl salicylate in ethyl alcohol (d = 0.7893 g/mL)?

Accepted Answer

A)  117.2 g isoamyl salicylate in 950.0 mL of ethyl alcohol 
B)  117.2 g isoamyl salicylate in 750.0 mL of ethyl alcohol 
C)  117.2 g isoamyl salicylate in 750.0 mL of solution 
D)  117.2 g isoamyl salicylate in 592.0 g of ethyl alcohol 
E)  none of the above

Question 20

From the following list of aqueous solutions and water, select the one with the highest boiling point.

Accepted Answer

A)  1.0 m KNO3 
B)  0.75 m NaCl 
C)  0.75 m CuCl2 
D)  2.0 m C12H22O11 (sucrose) 
E)  pure water

Exam 13: The Properties of Mixtures: Solutions and Colloids

The mole fraction of potassium nitrate in an aqueous solution is 0.0194. The solution's density is 1.0627 g/mL. Calculate the molarity of the solution.

Barbiturates are synthetic drugs used as sedatives and hypnotics. Barbital ( = 184.2 g/mol) is one of the simplest of these drugs. What is the boiling point of a solution prepared by dissolving 42.5 g of barbital in 825 g of acetic acid? K_b = 3.07°C/m; boiling point of pure acetic acid = 117.9°C

What volume of concentrated (14.7 M) phosphoric acid is needed to prepare 25.0 L of 3.0 M H₃PO₄?

Which of the following aqueous solutions should demonstrate the most non-ideal behavior?

A solution of sucrose (sugar) in water is in equilibrium with solid sucrose. If more solid sucrose is now added, with stirring,

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

Soda drinks bubble when the bottle is opened because

Aqueous ammonia is commercially available in a solution that is 28% (w/w) ammonia. What is the mole fraction of ammonia in such a solution?

Potassium fluoride is used for frosting glass. Calculate the molarity of a solution prepared by dissolving 78.6 g of KF in enough water to produce 225 mL of solution.

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

Potassium hydrogen phosphate is used in the preparation of non-dairy powdered creamers. Calculate the molarity of a solution prepared by dissolving 238 g of K₂HPO₄in enough water to produce 275 mL of solution.

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

A solution of ethanol (C₂H₆O) in water is sometimes used as a disinfectant. 1.00 L of this solution contains 553 g of ethanol and 335 g of water. What is the mole fraction of ethanol in this solution?

A 0.137 m solution of sodium ferrocyanide (Na₄Fe(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)

Which of the following pairs of ions is arranged so that the ion with the smaller charge density is listed first?

Calculate the freezing point of a solution made by dissolving 3.50 g of potassium chloride ( = 74.55 g/mol) in 100.0 g of water. Assume ideal behavior for the solution; K_f = 1.86°C/m.

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?

Children under the age of six with more than 0.10 ppm of lead in their blood can suffer a reduction in I.Q. or have behavior problems. What is the molality of a solution which contains 0.10 ppm of lead?

Isoamyl salicylate ( = 208.25 g/mol) has a pleasant aroma and is used in perfumes and soaps. Which of the following combinations gives a 0.75 m solution of isoamyl salicylate in ethyl alcohol (d = 0.7893 g/mL) ?

From the following list of aqueous solutions and water, select the one with the highest boiling point.

Exam 13: The Properties of Mixtures: Solutions and Colloids

The mole fraction of potassium nitrate in an aqueous solution is 0.0194. The solution's density is 1.0627 g/mL. Calculate the molarity of the solution.

Barbiturates are synthetic drugs used as sedatives and hypnotics. Barbital ( = 184.2 g/mol) is one of the simplest of these drugs. What is the boiling point of a solution prepared by dissolving 42.5 g of barbital in 825 g of acetic acid? Kb = 3.07°C/m; boiling point of pure acetic acid = 117.9°C

What volume of concentrated (14.7 M) phosphoric acid is needed to prepare 25.0 L of 3.0 M H3PO4?

Which of the following aqueous solutions should demonstrate the most non-ideal behavior?

A solution of sucrose (sugar) in water is in equilibrium with solid sucrose. If more solid sucrose is now added, with stirring,

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

Soda drinks bubble when the bottle is opened because

Aqueous ammonia is commercially available in a solution that is 28% (w/w) ammonia. What is the mole fraction of ammonia in such a solution?

Potassium fluoride is used for frosting glass. Calculate the molarity of a solution prepared by dissolving 78.6 g of KF in enough water to produce 225 mL of solution.

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

Potassium hydrogen phosphate is used in the preparation of non-dairy powdered creamers. Calculate the molarity of a solution prepared by dissolving 238 g of K2HPO4 in enough water to produce 275 mL of solution.

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

A solution of ethanol (C2H6O) in water is sometimes used as a disinfectant. 1.00 L of this solution contains 553 g of ethanol and 335 g of water. What is the mole fraction of ethanol in this solution?

A 0.137 m solution of sodium ferrocyanide (Na4Fe(CN)6.10H2O) in water has a freezing point depression of 0.755°C. Calculate the van't Hoff factor (i) under these conditions. (Kf = 1.86°C/m)

Which of the following pairs of ions is arranged so that the ion with the smaller charge density is listed first?

Calculate the freezing point of a solution made by dissolving 3.50 g of potassium chloride ( = 74.55 g/mol) in 100.0 g of water. Assume ideal behavior for the solution; Kf = 1.86°C/m.

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?

Children under the age of six with more than 0.10 ppm of lead in their blood can suffer a reduction in I.Q. or have behavior problems. What is the molality of a solution which contains 0.10 ppm of lead?

Isoamyl salicylate ( = 208.25 g/mol) has a pleasant aroma and is used in perfumes and soaps. Which of the following combinations gives a 0.75 m solution of isoamyl salicylate in ethyl alcohol (d = 0.7893 g/mL) ?

From the following list of aqueous solutions and water, select the one with the highest boiling point.

Barbiturates are synthetic drugs used as sedatives and hypnotics. Barbital ( = 184.2 g/mol) is one of the simplest of these drugs. What is the boiling point of a solution prepared by dissolving 42.5 g of barbital in 825 g of acetic acid? K_b = 3.07°C/m; boiling point of pure acetic acid = 117.9°C

What volume of concentrated (14.7 M) phosphoric acid is needed to prepare 25.0 L of 3.0 M H₃PO₄?

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

Potassium hydrogen phosphate is used in the preparation of non-dairy powdered creamers. Calculate the molarity of a solution prepared by dissolving 238 g of K₂HPO₄in enough water to produce 275 mL of solution.

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

A solution of ethanol (C₂H₆O) in water is sometimes used as a disinfectant. 1.00 L of this solution contains 553 g of ethanol and 335 g of water. What is the mole fraction of ethanol in this solution?

A 0.137 m solution of sodium ferrocyanide (Na₄Fe(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)

Calculate the freezing point of a solution made by dissolving 3.50 g of potassium chloride ( = 74.55 g/mol) in 100.0 g of water. Assume ideal behavior for the solution; K_f = 1.86°C/m.