Question 1

A solution of ethanol (C2H5OH)  in water is 15.0% ethanol by weight. The molality of this solution is:

Accepted Answer

A)   15.0 m
B)   3.83 m
C)   3.25 m
D)   1.77 m
E)   none of theseF) B) and C)
G) A) and B)

Question 2

Lauryl alcohol is obtained from coconut oil and found in many hair shampoos. A solution of 5.00 g of lauryl alcohol in 100.0 g of benzene boils at 80.78 ° C. What is the molar mass of lauryl alcohol if kb = 2.53 ° C/m and the normal boiling point of benzene is 80.10 ° C?

Accepted Answer

A)   1.3×102 g/mol
B)   1.6×102 g/mol
C)   1.9×102 g/mol
D)   2.5×102 g/mol
E)   46 g/molF) A) and C)
G) A) and B)

Question 3

Pepsin is an enzyme present in the human digestive tract. A 30.0 mL solution containing 0.500 grams of pepsin exhibits an osmotic pressure of 8.92 torr at 27.0 ° C. What is the molar mass of pepsin?

Accepted Answer

A)   35.0 g/mol
B)   46.0 g/mol
C)   3.15×103 g/mol
D)   3.50×104 g/mol
E)   3.54×106g/molF) B) and E)
G) C) and E)

Question 4

Which of the following would be least soluble in water?

Accepted Answer

A)   3C - CH2 - NH2 
C)   H3C - CH2 - CH2 - CH3 
D)   H3C - CH2 - OH 
E)   all are insoluble" class="answers-bank-image d-inline" rel="preload" > (acetone) 
B)   H3C - CH2 - NH2
C)   H3C - CH2 - CH2 - CH3
D)   H3C - CH2 - OH
E)   all are insolubleF) A) and E)
G) A) and C)

Question 5

In a study designed to prepare new gasoline-resistant coating, a polymer chemist dissolves 6.061 g poly(vinyl alcohol)  in enough water to make 100.0 mL of solution. At 25 ° C, the osmotic pressure of this solution is 0.248 atm. What is the molar mass of the polymer sample?

Accepted Answer

A)   0.0101 g/mol
B)   73.2 g/mol
C)   502 g/mol
D)   5.98×103 g/mol
E)   8.87×105 g/molF) A) and D)
G) A) and C)

Question 6

The concentration of O2 (g)  dissolved in water that is saturated with air (20 mole % O2)  is 2.86×10 - 4 molal. What is the Henry's law constant for this gas, in molal/atm?

Accepted Answer

A)   1.43×10 - 3
B)   2.86×10 - 4
C)   5.72×10 - 5
D)   8.01×10 - 3
E)   none of theseF) A) and C)
G) B) and C)

Question 7

Generally a process is considered favorably spontaneous if the process releases heat to the surroundings. The following three processes are necessary to dissolve a solute such as NaCl in a solvent such as water. Which of these is considered an exothermic process?
I. Solute-Solute interactions must be broken.
II. Solvent-Solvent interactions must be broken.
III. Solute-Solvent interactions are formed.

Accepted Answer

A)   I only
B)   II only
C)   III only
D)   I and II
E)   All of theseF) A) and E)
G) A) and B)

Question 8

What type of solute-solvent interaction is most important in a solution that contains Na2SO4 dissolved in water?

Accepted Answer

A)   Dipole-Dipole
B)   Ion-Dipole
C)   Hydrogen bonding interactions
D)   London dispersion-London dispersion interactions
E)   London dispersion-Dipole interactionsF) C) and E)
G) A) and B)

Question 9

A 10.0 mass percent solution of a nonelectrolyte dissolved in carbon tetrachloride has a boiling point that is 4.50 ° C higher than the solvent. What is the molar mass of this solute given kb is 5.03 ° C/m?

Accepted Answer

A)   112 g/mol
B)   124 g/mol
C)   150 g/mol
D)   11.2 g/mol
E)   none of theseF) D) and E)
G) All of the above

Question 10

The mole fraction of acetone in a solution prepared by mixing 58.1 g acetone (C3H6O)  and 72.1 g of H2O is:

Accepted Answer

A)   0.200
B)   0.250
C)   0.446
D)   0.806
E)   1.00F) A) and B)
G) A) and C)

Question 11

Ethylene glycol is mixed with water and added to an automobile's radiator. Which of the following occurs?
I. The freezing temperature of the mixture rises.
II. The vapor pressure inside the radiator increases.
III. The boiling temperature of the mixture rises.

Accepted Answer

A)   I only
B)   II only
C)   III only
D)   I and II
E)   All of theseF) A) and D)
G) B) and C)

Question 12

The density of a solution that is 18.0% by mass lead nitrate [Pb(NO3) 2] is 1.18 g/cm3. Calculate the molarity of the lead nitrate solution.

Accepted Answer

A)   4.9×10 - 7 M
B)   0.64 M
C)   12.0 M
D)   19.8 M
E)   15.3 MF) B) and E)
G) B) and C)

Question 13

What is the mole fraction of water for a mixture prepared by mixing 50.0 grams of glycerol (non-volatile solute)  and 500 grams of H2O?
Molar Mass(glycerol)  = 92.09 g/mol and Molar Mass(H2O)  = 18.02 g/mol

Accepted Answer

A)   c water = 0.0192
B)   c water = 0.0361
C)   c water = 0.0909
D)   c water = 0.909
E)   c water = 0.981F) B) and E)
G) D) and E)

Question 14

What is the mole fraction of glucose in a solution prepared by dissolving 9.01 grams of glucose, C6H12O6, in 17.1 grams of water?
Molar Mass(C6H12O6)  = 180.16 g/mol and Molar Mass(H2O)  = 18.02 g/mol

Accepted Answer

A)   c glucose = 0.0503
B)   c glucose = 0.345
C)   c glucose = 0.527
D)   c glucose = 0.909
E)   c glucose = 0.950F) B) and E)
G) B) and D)

Question 15

How many grams of Na2SO4 are required to make 43.5 mL of a 13.7% (m/v)  aqueous solution?

Accepted Answer

A)   0.168 g Na2SO4
B)   5.96 g Na2SO4
C)   13.7 g Na2SO4
D)   31.5 g Na2SO4
E)   318 g Na2SO4F) B) and E)
G) B) and D)

Question 16

The average osmotic pressure of blood is 7.70 atm at 25 ° C. What is the molar concentration of an aqueous glucose (C6H12O6)  solution that is isotonic (equal in concentration)  with blood?

Accepted Answer

A)   2.12×10 - 3 M
B)   0.128 M
C)   0.315 M
D)   1.53 M
E)   3.75 MF) B) and E)
G) C) and E)

Question 17

Which of the following colligative properties is the most sensitive to change in concentration?

Accepted Answer

A)   vapor pressure of solvent
B)   freezing point
C)   boiling point
D)   osmotic pressure
E)   all are about equally sensitiveF) A) and B)
G) A) and C)

Question 18

How many moles of solute are present in 50.0 grams of solution that is 2.50% by mass glucose (C6H12O6) ?
MM(C6H12O6)  = 180.16 g/mol

Accepted Answer

A)   6.94×10 - 3 moles
B)   0.800 moles
C)   1.25 moles
D)   11.1 moles
E)   225 molesF) B) and C)
G) A) and E)

Question 19

Commercial concentrated ammonium hydroxide is 28.0% (m/m)  NH3 and has a density of 0.890 g/mL. What is the molarity of a concentrated solution of ammonium hydroxide?
MW(NH3)  = 17.03 g/mol

Accepted Answer

A)   5.4 M
B)   14.6 M
C)   16.4 M
D)   18.5 M
E)   22.8 MF) B) and E)
G) B) and D)

Question 20

Calculate the osmotic pressure at 310 K of a sugar solution containing 42.0 g of sucrose (C12H22O11)  in 650 mL of solution.

Accepted Answer

A)   3.12 atm
B)   0.065 atm
C)   1.64 atm
D)   1069 atm
E)   4.80 atmF) B) and D)
G) D) and E)

Exam 12: Solutions

What is the mole fraction of water for a mixture prepared by mixing 50.0 grams of glycerol (non-volatile solute) and 500 grams of H₂O? Molar Mass(glycerol) = 92.09 g/mol and Molar Mass(H₂O) = 18.02 g/mol

Correct Answer
verified

Pepsin is an enzyme present in the human digestive tract. A 30.0 mL solution containing 0.500 grams of pepsin exhibits an osmotic pressure of 8.92 torr at 27.0 ° C. What is the molar mass of pepsin?

Correct Answer
verified

Which of the following would be least soluble in water?

Correct Answer
verified

Ethylene glycol is mixed with water and added to an automobile's radiator. Which of the following occurs? I. The freezing temperature of the mixture rises. II. The vapor pressure inside the radiator increases. III. The boiling temperature of the mixture rises.

Correct Answer
verified

Lauryl alcohol is obtained from coconut oil and found in many hair shampoos. A solution of 5.00 g of lauryl alcohol in 100.0 g of benzene boils at 80.78 ° C. What is the molar mass of lauryl alcohol if k_b = 2.53 ° C/m and the normal boiling point of benzene is 80.10 ° C?

Correct Answer
verified

Commercial concentrated ammonium hydroxide is 28.0% (m/m) NH₃ and has a density of 0.890 g/mL. What is the molarity of a concentrated solution of ammonium hydroxide? MW(NH₃) = 17.03 g/mol

Correct Answer
verified

The average osmotic pressure of blood is 7.70 atm at 25 ° C. What is the molar concentration of an aqueous glucose (C₆H₁₂O₆) solution that is isotonic (equal in concentration) with blood?

Correct Answer
verified

Correct Answer
verified

What is the mole fraction of glucose in a solution prepared by dissolving 9.01 grams of glucose, C₆H₁₂O₆, in 17.1 grams of water? Molar Mass(C₆H₁₂O₆) = 180.16 g/mol and Molar Mass(H₂O) = 18.02 g/mol

Correct Answer
verified

The mole fraction of acetone in a solution prepared by mixing 58.1 g acetone (C₃H₆O) and 72.1 g of H₂O is:

Correct Answer
verified

How many grams of Na₂SO₄ are required to make 43.5 mL of a 13.7% (m/v) aqueous solution?

Correct Answer
verified

The density of a solution that is 18.0% by mass lead nitrate [Pb(NO₃) ₂] is 1.18 g/cm³. Calculate the molarity of the lead nitrate solution.

Correct Answer
verified

Calculate the osmotic pressure at 310 K of a sugar solution containing 42.0 g of sucrose (C₁₂H₂₂O₁₁) in 650 mL of solution.

Correct Answer
verified

A 10.0 mass percent solution of a nonelectrolyte dissolved in carbon tetrachloride has a boiling point that is 4.50 ° C higher than the solvent. What is the molar mass of this solute given k_b is 5.03 ° C/m?

Correct Answer
verified

A solution of ethanol (C₂H₅OH) in water is 15.0% ethanol by weight. The molality of this solution is:

Correct Answer
verified

In a study designed to prepare new gasoline-resistant coating, a polymer chemist dissolves 6.061 g poly(vinyl alcohol) in enough water to make 100.0 mL of solution. At 25 ° C, the osmotic pressure of this solution is 0.248 atm. What is the molar mass of the polymer sample?

Correct Answer
verified

What type of solute-solvent interaction is most important in a solution that contains Na₂SO₄ dissolved in water?

Correct Answer
verified

The concentration of O₂ (g) dissolved in water that is saturated with air (20 mole % O₂) is 2.86×10^{- 4} molal. What is the Henry's law constant for this gas, in molal/atm?

Correct Answer
verified

How many moles of solute are present in 50.0 grams of solution that is 2.50% by mass glucose (C₆H₁₂O₆) ? MM(C₆H₁₂O₆) = 180.16 g/mol

Correct Answer
verified

Which of the following colligative properties is the most sensitive to change in concentration?

Correct Answer
verified

Exam 12: Solutions

What is the mole fraction of water for a mixture prepared by mixing 50.0 grams of glycerol (non-volatile solute) and 500 grams of H2O? Molar Mass(glycerol) = 92.09 g/mol and Molar Mass(H2O) = 18.02 g/mol

Correct AnswerverifiedShow Answer

Pepsin is an enzyme present in the human digestive tract. A 30.0 mL solution containing 0.500 grams of pepsin exhibits an osmotic pressure of 8.92 torr at 27.0 ° C. What is the molar mass of pepsin?

Correct AnswerverifiedShow Answer

Which of the following would be least soluble in water?

Correct AnswerverifiedShow Answer

Ethylene glycol is mixed with water and added to an automobile's radiator. Which of the following occurs? I. The freezing temperature of the mixture rises. II. The vapor pressure inside the radiator increases. III. The boiling temperature of the mixture rises.

Correct AnswerverifiedShow Answer

Lauryl alcohol is obtained from coconut oil and found in many hair shampoos. A solution of 5.00 g of lauryl alcohol in 100.0 g of benzene boils at 80.78 ° C. What is the molar mass of lauryl alcohol if kb = 2.53 ° C/m and the normal boiling point of benzene is 80.10 ° C?

Correct AnswerverifiedShow Answer

Commercial concentrated ammonium hydroxide is 28.0% (m/m) NH3 and has a density of 0.890 g/mL. What is the molarity of a concentrated solution of ammonium hydroxide? MW(NH3) = 17.03 g/mol

Correct AnswerverifiedShow Answer

The average osmotic pressure of blood is 7.70 atm at 25 ° C. What is the molar concentration of an aqueous glucose (C6H12O6) solution that is isotonic (equal in concentration) with blood?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

What is the mole fraction of glucose in a solution prepared by dissolving 9.01 grams of glucose, C6H12O6, in 17.1 grams of water? Molar Mass(C6H12O6) = 180.16 g/mol and Molar Mass(H2O) = 18.02 g/mol

Correct AnswerverifiedShow Answer

The mole fraction of acetone in a solution prepared by mixing 58.1 g acetone (C3H6O) and 72.1 g of H2O is:

Correct AnswerverifiedShow Answer

How many grams of Na2SO4 are required to make 43.5 mL of a 13.7% (m/v) aqueous solution?

Correct AnswerverifiedShow Answer

The density of a solution that is 18.0% by mass lead nitrate [Pb(NO3) 2] is 1.18 g/cm3. Calculate the molarity of the lead nitrate solution.

Correct AnswerverifiedShow Answer

Calculate the osmotic pressure at 310 K of a sugar solution containing 42.0 g of sucrose (C12H22O11) in 650 mL of solution.

Correct AnswerverifiedShow Answer

A 10.0 mass percent solution of a nonelectrolyte dissolved in carbon tetrachloride has a boiling point that is 4.50 ° C higher than the solvent. What is the molar mass of this solute given kb is 5.03 ° C/m?

Correct AnswerverifiedShow Answer

A solution of ethanol (C2H5OH) in water is 15.0% ethanol by weight. The molality of this solution is:

Correct AnswerverifiedShow Answer

In a study designed to prepare new gasoline-resistant coating, a polymer chemist dissolves 6.061 g poly(vinyl alcohol) in enough water to make 100.0 mL of solution. At 25 ° C, the osmotic pressure of this solution is 0.248 atm. What is the molar mass of the polymer sample?

Correct AnswerverifiedShow Answer

What type of solute-solvent interaction is most important in a solution that contains Na2SO4 dissolved in water?

Correct AnswerverifiedShow Answer

The concentration of O2 (g) dissolved in water that is saturated with air (20 mole % O2) is 2.86×10 - 4 molal. What is the Henry's law constant for this gas, in molal/atm?

Correct AnswerverifiedShow Answer

How many moles of solute are present in 50.0 grams of solution that is 2.50% by mass glucose (C6H12O6) ? MM(C6H12O6) = 180.16 g/mol

Correct AnswerverifiedShow Answer

Which of the following colligative properties is the most sensitive to change in concentration?

Correct AnswerverifiedShow Answer

What is the mole fraction of water for a mixture prepared by mixing 50.0 grams of glycerol (non-volatile solute) and 500 grams of H₂O? Molar Mass(glycerol) = 92.09 g/mol and Molar Mass(H₂O) = 18.02 g/mol

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Lauryl alcohol is obtained from coconut oil and found in many hair shampoos. A solution of 5.00 g of lauryl alcohol in 100.0 g of benzene boils at 80.78 ° C. What is the molar mass of lauryl alcohol if k_b = 2.53 ° C/m and the normal boiling point of benzene is 80.10 ° C?

Correct Answer
verified

Commercial concentrated ammonium hydroxide is 28.0% (m/m) NH₃ and has a density of 0.890 g/mL. What is the molarity of a concentrated solution of ammonium hydroxide? MW(NH₃) = 17.03 g/mol

Correct Answer
verified

The average osmotic pressure of blood is 7.70 atm at 25 ° C. What is the molar concentration of an aqueous glucose (C₆H₁₂O₆) solution that is isotonic (equal in concentration) with blood?

Correct Answer
verified

Correct Answer
verified

What is the mole fraction of glucose in a solution prepared by dissolving 9.01 grams of glucose, C₆H₁₂O₆, in 17.1 grams of water? Molar Mass(C₆H₁₂O₆) = 180.16 g/mol and Molar Mass(H₂O) = 18.02 g/mol

Correct Answer
verified

The mole fraction of acetone in a solution prepared by mixing 58.1 g acetone (C₃H₆O) and 72.1 g of H₂O is:

Correct Answer
verified

How many grams of Na₂SO₄ are required to make 43.5 mL of a 13.7% (m/v) aqueous solution?

Correct Answer
verified

The density of a solution that is 18.0% by mass lead nitrate [Pb(NO₃) ₂] is 1.18 g/cm³. Calculate the molarity of the lead nitrate solution.

Correct Answer
verified

Calculate the osmotic pressure at 310 K of a sugar solution containing 42.0 g of sucrose (C₁₂H₂₂O₁₁) in 650 mL of solution.

Correct Answer
verified

A 10.0 mass percent solution of a nonelectrolyte dissolved in carbon tetrachloride has a boiling point that is 4.50 ° C higher than the solvent. What is the molar mass of this solute given k_b is 5.03 ° C/m?

Correct Answer
verified

A solution of ethanol (C₂H₅OH) in water is 15.0% ethanol by weight. The molality of this solution is:

Correct Answer
verified

Correct Answer
verified

What type of solute-solvent interaction is most important in a solution that contains Na₂SO₄ dissolved in water?

Correct Answer
verified

The concentration of O₂ (g) dissolved in water that is saturated with air (20 mole % O₂) is 2.86×10^{- 4} molal. What is the Henry's law constant for this gas, in molal/atm?

Correct Answer
verified

How many moles of solute are present in 50.0 grams of solution that is 2.50% by mass glucose (C₆H₁₂O₆) ? MM(C₆H₁₂O₆) = 180.16 g/mol

Correct Answer
verified

Correct Answer
verified