Question 1

A solution is prepared by dissolving 49.3 g of KBr in enough water to form 473 mL of solution.Calculate the mass % of KBr in the solution if the density is 1.12 g/mL.

Accepted Answer

A)  10.4% 
B)  8.57% 
C)  10.1% 
D)  11.7% 
E)  9.31% 
A)  10.4% 
B)  8.57% 
C)  10.1% 
D)  11.7% 
E)  9.31%

Question 2

A solution containing more than the equilibrium amount is called

Accepted Answer

A)  an unsaturated solution. 
B)  a dilute solution. 
C)  a supersaturated solution. 
D)  a concentrated solution. 
E)  a saturated solution. 
A)  an unsaturated solution. 
B)  a dilute solution. 
C)  a supersaturated solution. 
D)  a concentrated solution. 
E)  a saturated solution.

Question 3

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 C4H10O4 
B)  0.50 m C2H6O2 
C)  0.50 m C5H12O5 
D)  0.50 m C11H24O11 
E)  They all have about the same vapor pressure. 
A)  0.50 m C4H10O4 
B)  0.50 m C2H6O2 
C)  0.50 m C5H12O5 
D)  0.50 m C11H24O11 
E)  They all have about the same vapor pressure.

Question 4

Choose the situation below that would result in a ΔHsolution near 0.

Accepted Answer

A) When >> B) When > C) When < D) When is close to E) There isn't enough information to determine. A) When >> B) When > C) When < D) When is close to E) There isn't enough information to determine.

Question 5

A compound is found to have a molar mass of 598 g/mol.If 35.8 mg of the compound is dissolved in enough water to make 175 mL of solution at 25°C,what is the osmotic pressure of the resulting solution?

Accepted Answer

A)  3.42 torr 
B)  6.36 torr 
C)  5.01 torr 
D)  5.99 torr 
E)  8.36 torr 
A)  3.42 torr 
B)  6.36 torr 
C)  5.01 torr 
D)  5.99 torr 
E)  8.36 torr

Question 6

What is the mole fraction of ethanol in a solution made by dissolving 29.2 g of ethanol,C2H5OH,in 53.6 g of water?

Accepted Answer

A)  0.176 
B)  0.213 
C)  0.352 
D)  0.545 
A)  0.176 
B)  0.213 
C)  0.352 
D)  0.545

Question 7

Calculate the osmotic pressure,in torr,of a solution containing 3.00 mg of a sugar (342 g/mole)in enough water to make 15.0 mL of solution at 25°C.

Accepted Answer

The answer of Calculate the osmotic pressure,in torr,of a solution...

Question 8

Choose the aqueous solution that has the highest boiling point.These are all solutions of nonvolatile solutes and you should assume ideal van't Hoff factors where applicable.

Accepted Answer

A)  0.100 m AlCl3 
B)  0.100 m Li Br 
C)  0.100 m Ba Cl2 
D)  0.100 m C6H12O6 
E)  They all have the same boiling point. 
A)  0.100 m AlCl3 
B)  0.100 m Li Br 
C)  0.100 m Ba Cl2 
D)  0.100 m C6H12O6 
E)  They all have the same boiling point.

Question 9

A 1.00 L sample of water contains 0.0044 g of Cl⁻ ions.Determine the concentration of chloride ions in ppm if the density of the solution is 1.00 g/mL.

Accepted Answer

A)  3.3 ppm 
B)  8.8 ppm 
C)  4.4 ppm 
D)  2.2 ppm 
E)  6.6 ppm 
A)  3.3 ppm 
B)  8.8 ppm 
C)  4.4 ppm 
D)  2.2 ppm 
E)  6.6 ppm

Question 10

A solution is prepared by dissolving 7.00 g of glycerin (C3H8O3)in 201 g of ethanol (C2H5OH).The freezing point of the solution is ________°C.The freezing point of pure ethanol is -114.6°C at 1 atm.The molal-freezing-point-depression constant (Kf)for ethanol is 1.99°C/m.The molar masses of glycerin and of ethanol are 92.1 g/mol and 46.1 g/mol,respectively.

Accepted Answer

A)  -121.3 
B)  0.752 
C)  -107.9 
D)  -113.8 
E)  -115.4 
A)  -121.3 
B)  0.752 
C)  -107.9 
D)  -113.8 
E)  -115.4

Question 11

Determine the freezing point of a solution that contains 78.8 g of naphthalene (C10H8,molar mass = 128.16 g/mol)dissolved in 722 mL of benzene (d = 0.877 g/mL).Pure benzene has a melting point of 5.50°C and a freezing point depression constant of 4.90°C/m.

Accepted Answer

A)  4.76°C 
B)  4.17°C 
C)  0.74°C 
D)  1.33°C 
E)  1.68°C 
A)  4.76°C 
B)  4.17°C 
C)  0.74°C 
D)  1.33°C 
E)  1.68°C

Question 12

Determine the molality of a solution prepared by dissolving 0.500 moles of CaF2 in 11.5 moles H2O.

Accepted Answer

A)  1.88 m 
B)  4.35 m 
C)  5.31 m 
D)  4.14 m 
E)  2.41 m 
A)  1.88 m 
B)  4.35 m 
C)  5.31 m 
D)  4.14 m 
E)  2.41 m

Question 13

Determine the boiling point of a solution that contains 78.8 g of naphthalene (C10H8,molar mass = 128.16 g/mol)dissolved in 722 mL of benzene (d = 0.877 g/mL).Pure benzene has a boiling point of 80.1°C and a boiling point elevation constant of 2.53°C/m.

Accepted Answer

A)  2.2°C 
B)  2.5°C 
C)  82.3°C 
D)  80.4°C 
E)  82.6°C 
A)  2.2°C 
B)  2.5°C 
C)  82.3°C 
D)  80.4°C 
E)  82.6°C

Question 14

What mass of ethane (CH3CH3)is contained in 50.0 mL of a 13.9% by mass solution of ethane in hexane? The density of the solution is 0.611 g/mL.

Accepted Answer

A)  2.35 g 
B)  8.49 g 
C)  11.8 g 
D)  6.95 g 
E)  4.25 g 
A)  2.35 g 
B)  8.49 g 
C)  11.8 g 
D)  6.95 g 
E)  4.25 g

Question 15

Determine the partial pressure of oxygen necessary to form an aqueous solution that is 6.5 × 10-4 M O2 at 25°C.The Henry's law constant for oxygen in water at 25°C is 1.3 × 10-3 M/atm.

Accepted Answer

A)  1.2 atm 
B)  0.85 atm 
C)  0.78 atm 
D)  2.0 atm 
E)  0.50 atm 
A)  1.2 atm 
B)  0.85 atm 
C)  0.78 atm 
D)  2.0 atm 
E)  0.50 atm

Question 16

Give the preparation of rock candy.

Accepted Answer

A saturated solution of sugar is prepare

Question 17

The osmotic pressure of a solution formed by dissolving 25.0 mg of aspirin (C9H8O4)in enough water to make 0.250 L of solution at 25°C is ________ atm.

Accepted Answer

A)  13.6 
B)  1.14 × 10-3 
C)  0.0136 
D)  2.45 
E)  1.38 
A)  13.6 
B)  1.14 × 10-3 
C)  0.0136 
D)  2.45 
E)  1.38

Question 18

What mass of CuCl2 is contained in 90.85 g of a 22.4% by mass solution of CuCl2 in water?

Accepted Answer

A)  20.4 g 
B)  4.91 g 
C)  24.6 g 
D)  40.6 g 
E)  11.2 g 
A)  20.4 g 
B)  4.91 g 
C)  24.6 g 
D)  40.6 g 
E)  11.2 g

Question 19

Calculate the molality of a solution that is prepared by mixing 25.5 mL of CH3OH (d = 0.792 g/mL)and 387 mL of CH3CH2CH2OH (d = 0.811 g/mL).

Accepted Answer

A)  0.630 m 
B)  0.812 m 
C)  1.57 m 
D)  2.01 m 
E)  4.98 m 
A)  0.630 m 
B)  0.812 m 
C)  1.57 m 
D)  2.01 m 
E)  4.98 m

Question 20

A solution is prepared by dissolving 16.2 g of benzene (C6H6)in 282 g of carbon tetrachloride (CCl4).The concentration of benzene in this solution is ________ molal.The molar masses of C6H6 and CCl4 are 78.1 g/mol and 154 g/mol,respectively.

Accepted Answer

A)  7.36 × 10-4 
B)  0.736 
C)  0.102 
D)  0.0543 
E)  5.43 
A)  7.36 × 10-4 
B)  0.736 
C)  0.102 
D)  0.0543 
E)  5.43

Exam 14: Solutions

A solution is prepared by dissolving 49.3 g of KBr in enough water to form 473 mL of solution.Calculate the mass % of KBr in the solution if the density is 1.12 g/mL.

A solution containing more than the equilibrium amount is called

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 situation below that would result in a ΔHsolution near 0.

A compound is found to have a molar mass of 598 g/mol.If 35.8 mg of the compound is dissolved in enough water to make 175 mL of solution at 25°C,what is the osmotic pressure of the resulting solution?

What is the mole fraction of ethanol in a solution made by dissolving 29.2 g of ethanol,C2H5OH,in 53.6 g of water?

Calculate the osmotic pressure,in torr,of a solution containing 3.00 mg of a sugar (342 g/mole)in enough water to make 15.0 mL of solution at 25°C.

Choose the aqueous solution that has the highest boiling point.These are all solutions of nonvolatile solutes and you should assume ideal van't Hoff factors where applicable.

A 1.00 L sample of water contains 0.0044 g of Cl⁻ ions.Determine the concentration of chloride ions in ppm if the density of the solution is 1.00 g/mL.

Determine the freezing point of a solution that contains 78.8 g of naphthalene (C10H8,molar mass = 128.16 g/mol)dissolved in 722 mL of benzene (d = 0.877 g/mL).Pure benzene has a melting point of 5.50°C and a freezing point depression constant of 4.90°C/m.

Determine the molality of a solution prepared by dissolving 0.500 moles of CaF2 in 11.5 moles H2O.

Determine the boiling point of a solution that contains 78.8 g of naphthalene (C10H8,molar mass = 128.16 g/mol)dissolved in 722 mL of benzene (d = 0.877 g/mL).Pure benzene has a boiling point of 80.1°C and a boiling point elevation constant of 2.53°C/m.

What mass of ethane (CH3CH3)is contained in 50.0 mL of a 13.9% by mass solution of ethane in hexane? The density of the solution is 0.611 g/mL.

Determine the partial pressure of oxygen necessary to form an aqueous solution that is 6.5 × 10-4 M O2 at 25°C.The Henry's law constant for oxygen in water at 25°C is 1.3 × 10-3 M/atm.

Give the preparation of rock candy.

The osmotic pressure of a solution formed by dissolving 25.0 mg of aspirin (C9H8O4)in enough water to make 0.250 L of solution at 25°C is ________ atm.

What mass of CuCl2 is contained in 90.85 g of a 22.4% by mass solution of CuCl2 in water?

Calculate the molality of a solution that is prepared by mixing 25.5 mL of CH3OH (d = 0.792 g/mL)and 387 mL of CH3CH2CH2OH (d = 0.811 g/mL).

A solution is prepared by dissolving 16.2 g of benzene (C6H6)in 282 g of carbon tetrachloride (CCl4).The concentration of benzene in this solution is ________ molal.The molar masses of C6H6 and CCl4 are 78.1 g/mol and 154 g/mol,respectively.

Essentials: Units, Measurements, and Problem Solving

Atoms

The Quantum Mechanical Model of the Atom

Periodic Properties of the Elements

Molecules and Compounds

Chemical Bonding I

Chemical Bonding Ii

Chemical Reactions and Chemical Quantities

Introduction to Solutions and Aqueous Reactions

Thermochemistry

Gases

Liquids, Solids, and Intermolecular Forces

Crystalline Solids and Modern Materials

Chemical Kinetics

Chemical Equilibrium

Acids and Bases

Aqueous Ionic Equilibrium

Free Energy and Thermodynamics

Electrochemistry

Radioactivity and Nuclear Chemistry

Organic Chemistry

Transition Metals and Coordination Compounds

Filters

Choose the situation below that would result in a ΔH_solution near 0.

What is the mole fraction of ethanol in a solution made by dissolving 29.2 g of ethanol,C₂H₅OH,in 53.6 g of water?

Determine the freezing point of a solution that contains 78.8 g of naphthalene (C₁₀H₈,molar mass = 128.16 g/mol)dissolved in 722 mL of benzene (d = 0.877 g/mL).Pure benzene has a melting point of 5.50°C and a freezing point depression constant of 4.90°C/m.

Determine the molality of a solution prepared by dissolving 0.500 moles of CaF₂ in 11.5 moles H₂O.

Determine the boiling point of a solution that contains 78.8 g of naphthalene (C₁₀H₈,molar mass = 128.16 g/mol)dissolved in 722 mL of benzene (d = 0.877 g/mL).Pure benzene has a boiling point of 80.1°C and a boiling point elevation constant of 2.53°C/m.

What mass of ethane (CH₃CH₃)is contained in 50.0 mL of a 13.9% by mass solution of ethane in hexane? The density of the solution is 0.611 g/mL.

Determine the partial pressure of oxygen necessary to form an aqueous solution that is 6.5 × 10^-4M O₂ at 25°C.The Henry's law constant for oxygen in water at 25°C is 1.3 × 10^-3 M/atm.

The osmotic pressure of a solution formed by dissolving 25.0 mg of aspirin (C₉H₈O₄)in enough water to make 0.250 L of solution at 25°C is ________ atm.

What mass of CuCl₂ is contained in 90.85 g of a 22.4% by mass solution of CuCl₂ in water?

Calculate the molality of a solution that is prepared by mixing 25.5 mL of CH₃OH (d = 0.792 g/mL)and 387 mL of CH₃CH₂CH₂OH (d = 0.811 g/mL).

A solution is prepared by dissolving 16.2 g of benzene (C₆H₆)in 282 g of carbon tetrachloride (CCl₄).The concentration of benzene in this solution is ________ molal.The molar masses of C₆H₆ and CCl₄ are 78.1 g/mol and 154 g/mol,respectively.