Question 1

Match the following.
-0.020 m NH4Cl

Accepted Answer

A) largest van't Hoff factor 
B) solution of ionic compound with highest freezing point 
C) solution with ΔTb = 0.026°C 
D) highest boiling point 
E) solution that is most strongly dependent upon pressure 
A) largest van't Hoff factor 
B) solution of ionic compound with highest freezing point 
C) solution with ΔTb = 0.026°C 
D) highest boiling point 
E) solution that is most strongly dependent upon pressure

Question 2

At 20°C,a 2.32 M aqueous solution of ammonium chloride has a density of 1.0344 g/mL.What is the molality of ammonium chloride in the solution? The formula weight of NH4Cl is 53.50 g/mol.

Accepted Answer

A) 2.55 
B) 0.0449 
C) 2.32 
D) 0.446 
E) 12.00 
A) 2.55 
B) 0.0449 
C) 2.32 
D) 0.446 
E) 12.00

Question 3

What is the mole fraction of I2 in a solution made by dissolving 55.6 g of I2 in 245 g of hexane,C6H14?

Accepted Answer

A) 0.0715 
B) 0.0770 
C) 0.133 
D) 0.154 
A) 0.0715 
B) 0.0770 
C) 0.133 
D) 0.154

Question 4

Calculate the freezing point of a solution containing 5.0 grams of KCl and 550.0 grams of water.The molal-freezing-point-depression constant (Kf)for water is 1.86°C/m.

Accepted Answer

A) -0.45°C 
B) +0.45°C 
C) -0.23°C 
D) +0.23°C 
E) 1.23°C 
A) -0.45°C 
B) +0.45°C 
C) -0.23°C 
D) +0.23°C 
E) 1.23°C

Question 5

Identify the colligative property.

Accepted Answer

A) vapor pressure lowering 
B) freezing point depression 
C) boiling point elevation 
D) osmotic pressure 
E) all of the above 
A) vapor pressure lowering 
B) freezing point depression 
C) boiling point elevation 
D) osmotic pressure 
E) all of the above

Question 6

What molality of pentane is obtained by dissolving 15 g pentane,C5H12,in 245.0 g hexane,C6H14?

Accepted Answer

A) 0.058 m 
B) 0.068 m 
C) 0.85 m 
D) 61 m 
A) 0.058 m 
B) 0.068 m 
C) 0.85 m 
D) 61 m

Question 7

A solution is prepared by adding 1.43 mol of KCl to 889 g of water.The concentration of KCl is ________ molal.

Accepted Answer

A) 1.61 × 10-3 
B) 622 
C) 0.622 
D) 1.27 × 103 
E) 1.61 
A) 1.61 × 10-3 
B) 622 
C) 0.622 
D) 1.27 × 103 
E) 1.61

Question 8

A solution of LiCl in water has XLiCl = 0.0900.What is the molality?

Accepted Answer

A) 4.46 m LiCl 
B) 5.00 m LiCl 
C) 5.49 m LiCl 
D) 9.89 m LiCl 
A) 4.46 m LiCl 
B) 5.00 m LiCl 
C) 5.49 m LiCl 
D) 9.89 m LiCl

Question 9

How many moles of KF are contained in 347 g of water in a 0.175 m KF solution?

Accepted Answer

A) 1.65 × 10-2 mol KF 
B) 5.04 × 10-2 mol KF 
C) 6.07 × 10-2 mol KF 
D) 3.22 × 10-2 mol KF 
E) 1.98 × 10-2 mol KF 
A) 1.65 × 10-2 mol KF 
B) 5.04 × 10-2 mol KF 
C) 6.07 × 10-2 mol KF 
D) 3.22 × 10-2 mol KF 
E) 1.98 × 10-2 mol KF

Question 10

Which aqueous solution has the lowest boiling point?

Accepted Answer

A) 0.10 m AlCl3 
B) 0.10 m NaCl 
C) 0.10 m BaCl2 
D) 0.10 m C6H12O6 
A) 0.10 m AlCl3 
B) 0.10 m NaCl 
C) 0.10 m BaCl2 
D) 0.10 m C6H12O6

Question 11

Match the following.
-0.010 m Al(NO3)3

Accepted Answer

A) largest van't Hoff factor 
B) solution of ionic compound with highest freezing point 
C) solution with ΔTb = 0.026°C 
D) highest boiling point 
E) solution that is most strongly dependent upon pressure 
A) largest van't Hoff factor 
B) solution of ionic compound with highest freezing point 
C) solution with ΔTb = 0.026°C 
D) highest boiling point 
E) solution that is most strongly dependent upon pressure

Question 12

Give the term for amount of solute in mole per mass of solvent in kg.

Accepted Answer

A) molality 
B) molarity 
C) mole fraction 
D) mole percent 
E) mass percent 
A) molality 
B) molarity 
C) mole fraction 
D) mole percent 
E) mass percent

Question 13

A 150.0 mL sample of an aqueous solution at 25°C contains 15.2 mg of an unknown nonelectrolyte compound.If the solution has an osmotic pressure of 8.44 torr,what is the molar mass of the unknown compound?

Accepted Answer

A) 223 g/mol 
B) 294 g/mol 
C) 341 g/mol 
D) 448 g/mol 
E) 195 g/mol 
A) 223 g/mol 
B) 294 g/mol 
C) 341 g/mol 
D) 448 g/mol 
E) 195 g/mol

Question 14

Which of the following statements is true?

Accepted Answer

A) The solubility of a gas in water increases with increasing pressure. 
B) The solubility of a gas in water decreases with increasing pressure. 
C) The solubility of a gas in water increases with decreasing pressure. 
D) The solubility of a gas in water decreases with decreasing pressure. 
E) None of the above statements are true. 
A) The solubility of a gas in water increases with increasing pressure. 
B) The solubility of a gas in water decreases with increasing pressure. 
C) The solubility of a gas in water increases with decreasing pressure. 
D) The solubility of a gas in water decreases with decreasing pressure. 
E) None of the above statements are true.

Question 15

Calculate the molality of a solution formed by dissolving 27.8 g of LiI in 500.0 mL of water.

Accepted Answer

A) 0.254 m 
B) 0.394 m 
C) 0.556 m 
D) 0.241 m 
E) 0.415 m 
A) 0.254 m 
B) 0.394 m 
C) 0.556 m 
D) 0.241 m 
E) 0.415 m

Question 16

Choose the aqueous solution with the lowest vapor pressure.These are all solutions of nonvolatile solutes and you should assume ideal van't Hoff factors where applicable.

Accepted Answer

A) 0.120 m C2H6O2 
B) 0.040 m (NH4)2SO4 
C) 0.060 m K2CO3 
D) 0.030 m LiC2H3O2 
E) They all have the same vapor pressure. 
A) 0.120 m C2H6O2 
B) 0.040 m (NH4)2SO4 
C) 0.060 m K2CO3 
D) 0.030 m LiC2H3O2 
E) They all have the same vapor pressure.

Question 17

Choose the aqueous solution with the highest vapor pressure.These are all solutions of nonvolatile solutes and you should assume ideal van't Hoff factors where applicable.

Accepted Answer

A) 0.50 m C3H8O3 
B) 0.50 m C2H6O2 
C) 0.50 m C6H12O6 
D) 0.50 m C12H22O11 
E) They all have about the same vapor pressure. 
A) 0.50 m C3H8O3 
B) 0.50 m C2H6O2 
C) 0.50 m C6H12O6 
D) 0.50 m C12H22O11 
E) They all have about the same vapor pressure.

Question 18

Choose the aqueous solution below with the lowest freezing point.These are all solutions of nonvolatile solutes and you should assume ideal van't Hoff factors where applicable.

Accepted Answer

A) 0.075 m LiCl 
B) 0.075 m (NH4)3PO4 
C) 0.075 m NaBrO4 
D) 0.075 m KCN 
E) 0.075 m KNO2 
A) 0.075 m LiCl 
B) 0.075 m (NH4)3PO4 
C) 0.075 m NaBrO4 
D) 0.075 m KCN 
E) 0.075 m KNO2

Question 19

An aqueous solution is 0.387 M in HCl.What is the molality of the solution if the density is 1.23 g/mL?

Accepted Answer

A) 0.115 m 
B) 0.387 m 
C) 0.315 m 
D) 0.411 m 
E) 0.318 m 
A) 0.115 m 
B) 0.387 m 
C) 0.315 m 
D) 0.411 m 
E) 0.318 m

Question 20

What mass of CuCl2 is contained in 75.85 g of a 22.4% by mass solution of CuCl2 in water.

Accepted Answer

A) 17.0 g 
B) 5.89 g 
C) 29.5 g 
D) 33.9 g 
E) 11.2 g 
A) 17.0 g 
B) 5.89 g 
C) 29.5 g 
D) 33.9 g 
E) 11.2 g

Match the following. -0.020 m NH₄Cl

At 20°C,a 2.32 M aqueous solution of ammonium chloride has a density of 1.0344 g/mL.What is the molality of ammonium chloride in the solution? The formula weight of NH₄Cl is 53.50 g/mol.

What is the mole fraction of I₂ in a solution made by dissolving 55.6 g of I₂ in 245 g of hexane,C₆H₁₄?

Calculate the freezing point of a solution containing 5.0 grams of KCl and 550.0 grams of water.The molal-freezing-point-depression constant (K_f)for water is 1.86°C/m.

Identify the colligative property.

What molality of pentane is obtained by dissolving 15 g pentane,C₅H₁₂,in 245.0 g hexane,C₆H₁₄?

A solution is prepared by adding 1.43 mol of KCl to 889 g of water.The concentration of KCl is ________ molal.

A solution of LiCl in water has X_LiCl = 0.0900.What is the molality?

How many moles of KF are contained in 347 g of water in a 0.175 m KF solution?

Which aqueous solution has the lowest boiling point?

Match the following. -0.010 m Al(NO₃)₃

Give the term for amount of solute in mole per mass of solvent in kg.

A 150.0 mL sample of an aqueous solution at 25°C contains 15.2 mg of an unknown nonelectrolyte compound.If the solution has an osmotic pressure of 8.44 torr,what is the molar mass of the unknown compound?

Which of the following statements is true?

Calculate the molality of a solution formed by dissolving 27.8 g of LiI in 500.0 mL of water.

Choose the aqueous solution with the lowest vapor pressure.These are all solutions of nonvolatile solutes and you should assume ideal van't Hoff factors where applicable.

Choose the aqueous solution with the highest vapor pressure.These are all solutions of nonvolatile solutes and you should assume ideal van't Hoff factors where applicable.

Choose the aqueous solution below with the lowest freezing point.These are all solutions of nonvolatile solutes and you should assume ideal van't Hoff factors where applicable.

An aqueous solution is 0.387 M in HCl.What is the molality of the solution if the density is 1.23 g/mL?

What mass of CuCl₂ is contained in 75.85 g of a 22.4% by mass solution of CuCl₂ in water.

Matter, Measurement, and Problem Solving

Atoms and Elements

Molecules, Compounds and Chemical Equations

Chemical Quantities and Aqueous Reactions

Gases

Thermochemistry

The Quantum-Mechanical Model of the Atom

Periodic Properties of the Elements

Chemical Bonding I: Lewis Theory

Chemical Bonding II: Molecular Shapes, Valence Bond Theory, and

Liquids, Solids, and Intermolecular Forces

Chemical Kinetics

Chemical Equilibrium

Acids and Bases

Aqueous Ionic Equilibrium

Free Energy and Thermodynamics

Electrochemistry

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Filters

Exam 12: Solutions

Match the following. -0.020 m NH4Cl

At 20°C,a 2.32 M aqueous solution of ammonium chloride has a density of 1.0344 g/mL.What is the molality of ammonium chloride in the solution? The formula weight of NH4Cl is 53.50 g/mol.

What is the mole fraction of I2 in a solution made by dissolving 55.6 g of I2 in 245 g of hexane,C6H14?

Calculate the freezing point of a solution containing 5.0 grams of KCl and 550.0 grams of water.The molal-freezing-point-depression constant (Kf)for water is 1.86°C/m.

Identify the colligative property.

What molality of pentane is obtained by dissolving 15 g pentane,C5H12,in 245.0 g hexane,C6H14?

A solution is prepared by adding 1.43 mol of KCl to 889 g of water.The concentration of KCl is ________ molal.

A solution of LiCl in water has XLiCl = 0.0900.What is the molality?

How many moles of KF are contained in 347 g of water in a 0.175 m KF solution?

Which aqueous solution has the lowest boiling point?

Match the following. -0.010 m Al(NO3)3

Give the term for amount of solute in mole per mass of solvent in kg.

A 150.0 mL sample of an aqueous solution at 25°C contains 15.2 mg of an unknown nonelectrolyte compound.If the solution has an osmotic pressure of 8.44 torr,what is the molar mass of the unknown compound?

Which of the following statements is true?

Calculate the molality of a solution formed by dissolving 27.8 g of LiI in 500.0 mL of water.

Choose the aqueous solution with the lowest vapor pressure.These are all solutions of nonvolatile solutes and you should assume ideal van't Hoff factors where applicable.

Choose the aqueous solution with the highest vapor pressure.These are all solutions of nonvolatile solutes and you should assume ideal van't Hoff factors where applicable.

Choose the aqueous solution below with the lowest freezing point.These are all solutions of nonvolatile solutes and you should assume ideal van't Hoff factors where applicable.

An aqueous solution is 0.387 M in HCl.What is the molality of the solution if the density is 1.23 g/mL?

What mass of CuCl2 is contained in 75.85 g of a 22.4% by mass solution of CuCl2 in water.

Matter, Measurement, and Problem Solving

Atoms and Elements

Molecules, Compounds and Chemical Equations

Chemical Quantities and Aqueous Reactions

Gases

Thermochemistry

The Quantum-Mechanical Model of the Atom

Periodic Properties of the Elements

Chemical Bonding I: Lewis Theory

Chemical Bonding II: Molecular Shapes, Valence Bond Theory, and

Liquids, Solids, and Intermolecular Forces

Chemical Kinetics

Chemical Equilibrium

Acids and Bases

Aqueous Ionic Equilibrium

Free Energy and Thermodynamics

Electrochemistry

Radioactivity and Nuclear Chemistry

Filters

Match the following. -0.020 m NH₄Cl

At 20°C,a 2.32 M aqueous solution of ammonium chloride has a density of 1.0344 g/mL.What is the molality of ammonium chloride in the solution? The formula weight of NH₄Cl is 53.50 g/mol.

What is the mole fraction of I₂ in a solution made by dissolving 55.6 g of I₂ in 245 g of hexane,C₆H₁₄?

Calculate the freezing point of a solution containing 5.0 grams of KCl and 550.0 grams of water.The molal-freezing-point-depression constant (K_f)for water is 1.86°C/m.

What molality of pentane is obtained by dissolving 15 g pentane,C₅H₁₂,in 245.0 g hexane,C₆H₁₄?

A solution of LiCl in water has X_LiCl = 0.0900.What is the molality?

Match the following. -0.010 m Al(NO₃)₃

What mass of CuCl₂ is contained in 75.85 g of a 22.4% by mass solution of CuCl₂ in water.