Question 1

Explain why the van't Hoff factor for MgCl2 is less than its predicted value.

Accepted Answer

The hydrated Mg²⁺ and Cl^- ions ca...

Question 2

How much water must be added to 40.0 g of CaCl2 to produce a solution that is 35.0 wt% CaCl2?

Accepted Answer

A)  54.0 g
B)  74.2 g
C)  87.5 g
D)  114 g

Question 3

A compound is found to have a molar mass of 190 g mol-1.If 0.0673 g of the compound is dissolved in enough water to make 200 mL of solution at 25 °C,what is the osmotic pressure of the resulting solution?

Accepted Answer

A)  1.21 × 10-2 bar
B)  6.12 × 10-2 bar
C)  4.39 × 10-2 bar
D)  3.97 × 10-2 bar
E)  2.28 × 10-2 bar

Question 4

Which of the following statements is TRUE?

Accepted Answer

A)  In general,the solubility of a solid in water decreases with increasing temperature.
B)  In general,the solubility of a gas in water decreases with increasing temperature.
C)  The solubility of a gas in water usually increases with decreasing pressure.
D)  The solubility of an ionic solid in water decreases with increasing temperature.
E)  None of the above statements is true.

Question 5

Which of the following statements is TRUE?

Accepted Answer

A)  The solubility of a gas is not dependent on either temperature or pressure.
B)  The solubility of a gas is highly dependent on pressure.
C)  The solubility of a gas is highly dependent on both pressure and temperature.
D)  The solubility of a gas is highly dependent on temperature.
E)  None of the above.

Question 6

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

Accepted Answer

A)  0.50 mol kg-1 C3H8O3
B)  0.50 mol kg-1 C2H6O2
C)  0.50 mol kg-1 C6H12O6
D)  0.50 mol kg-1 C12H22O11
E)  They all have about the same vapour pressure.

Question 7

Identify the classification of milk.

Accepted Answer

A)  aerosol
B)  solid aerosol
C)  foam
D)  emulsion
E)  solid emulsion

Question 8

Calculate the vapour pressure of pure water at 85 °C if a 285 mL solution containing 173.0 g of mannose,C6H12O6,has a vapour pressure of 545.0 mbar.

Accepted Answer

A)  531 mbar
B)  578 mbar
C)  508 mbar
D)  599 mbar
E)  520 mbar

Question 9

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 mol kg-1 AlCl3
B)  0.100 mol kg-1 NaCl
C)  0.100 mol kg-1 MgCl2
D)  0.100 mol kg-1 C6H12O6
E)  They all have the same boiling point.

Question 10

A solution of LiCl in water is 20.0 wt% LiCl.What is the mole fraction of LiCl? Assume the density of the solution is 1.00 g mL-1.

Accepted Answer

A)  0.0960
B)  0.106
C)  0.472
D)  4.44

Question 11

Identify the compound whose solubility is least affected by temperature.

Accepted Answer

A)  Na2SO4
B)  K2Cr2O7
C)  KNO3
D)  KClO3
E)  NaCl

Question 12

Choose the situation below that would result in an exothermic ?solutionH.

Accepted Answer

A)  when  ∣Δsolute H∣|\Delta _ { 	ext {solute } } H \mid∣Δsolute ​H∣  > ∣Δ hydration H∣|\Delta 	ext { hydration } H \mid∣Δ hydration H∣ 
B)  when  ∣Δsolute H∣|\Delta _ { 	ext {solute } } H \mid∣Δsolute ​H∣  is close to ∣Δ hydration H∣|\Delta 	ext { hydration } H \mid∣Δ hydration H∣ 
C)  when  ∣Δsolute H∣|\Delta _ { 	ext {solute } } H \mid∣Δsolute ​H∣  ∣Δ hydration H∣|\Delta 	ext { hydration } H \mid∣Δ hydration H∣ 
D)  when  ∣Δsolvent H∣\left| \Delta _ { 	ext {solvent } } H ight|∣Δsolvent ​H∣  > ∣Δsolute H∣|\Delta _ { 	ext {solute } } H \mid∣Δsolute ​H∣ 
E)  There isn't enough information to determine the answer.

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-1
B)  294 g mol-1
C)  341 g mol-1
D)  448 g mol-1
E)  195 g mol-1

Question 14

Identify the classification of whipped cream.

Accepted Answer

A)  aerosol
B)  solid aerosol
C)  foam
D)  emulsion
E)  solid emulsion

Question 15

Identify the solute with the lowest van't Hoff factor.

Accepted Answer

A)  nonelectrolyte
B)  NaCl
C)  MgSO4
D)  MgCl2
E)  FeCl3

Question 16

Calculate the total solution volume required to produce an osmotic pressure of 4.87 mbar using 8.21 mg of a protein with a molar mass of 4450 g mol-1 at 25.0 °C.

Accepted Answer

A)  10.6 mL
B)  4.79 mL
C)  12.3 mL
D)  9.39 mL
E)  8.00 mL

Question 17

An aqueous solution is 0.387 mol L-1 in HCl.What is the molality of the solution if the density is 1.23 g mL-1?

Accepted Answer

A)  0.115 mol kg-1
B)  0.387 mol kg-1
C)  0.315 mol kg-1
D)  0.411 mol kg-1
E)  0.318 mol kg-1

Question 18

Define a colloid.

Accepted Answer

A colloid is a mixtu...

Question 19

A compound is found to have a molar mass of 598 g mol-1.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 × 10-3 bar
B)  8.48 × 10-3 bar
C)  5.01 × 10-3 bar
D)  5.99 × 10-3 bar
E)  8.06 × 10-3 bar

Question 20

Calculate the mass of oxygen (in mg) dissolved in a 5.00 L bucket of water exposed to a pressure of 1.13 bar of air.Assume the mole fraction of oxygen in air to be 0.21 and the Henry's law constant for oxygen in water at this temperature to be 1.3 × 10-3 mol L-1 bar-1.

Accepted Answer

A)  49.4 mg
B)  23.5 mg
C)  9.87 mg
D)  27.3 mg
E)  13.7 mg

Exam 12: Solutions

Calculate the total solution volume required to produce an osmotic pressure of 4.87 mbar using 8.21 mg of a protein with a molar mass of 4450 g mol-1 at 25.0 °C.

Correct AnswerverifiedShow Answer

Calculate the mass of oxygen (in mg) dissolved in a 5.00 L bucket of water exposed to a pressure of 1.13 bar of air.Assume the mole fraction of oxygen in air to be 0.21 and the Henry's law constant for oxygen in water at this temperature to be 1.3 × 10-3 mol L-1 bar-1.

Correct AnswerverifiedShow Answer

Identify the classification of whipped cream.

Correct AnswerverifiedShow Answer

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.

Correct AnswerverifiedShow Answer

A solution of LiCl in water is 20.0 wt% LiCl.What is the mole fraction of LiCl? Assume the density of the solution is 1.00 g mL-1.

Correct AnswerverifiedShow Answer

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?

Correct AnswerverifiedShow Answer

Explain why the van't Hoff factor for MgCl2 is less than its predicted value.

Correct AnswerverifiedThe hydrated Mg2+ and Cl- ions ca...View AnswerShow Answer

Identify the compound whose solubility is least affected by temperature.

Correct AnswerverifiedShow Answer

Calculate the vapour pressure of pure water at 85 °C if a 285 mL solution containing 173.0 g of mannose,C6H12O6,has a vapour pressure of 545.0 mbar.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

An aqueous solution is 0.387 mol L-1 in HCl.What is the molality of the solution if the density is 1.23 g mL-1?

Correct AnswerverifiedShow Answer

Which of the following statements is TRUE?

Correct AnswerverifiedShow Answer

A compound is found to have a molar mass of 190 g mol-1.If 0.0673 g of the compound is dissolved in enough water to make 200 mL of solution at 25 °C,what is the osmotic pressure of the resulting solution?

Correct AnswerverifiedShow Answer

Identify the solute with the lowest van't Hoff factor.

Correct AnswerverifiedShow Answer

Which of the following statements is TRUE?

Correct AnswerverifiedShow Answer

How much water must be added to 40.0 g of CaCl2 to produce a solution that is 35.0 wt% CaCl2?

Correct AnswerverifiedShow Answer

Identify the classification of milk.

Correct AnswerverifiedShow Answer

A compound is found to have a molar mass of 598 g mol-1.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?

Correct AnswerverifiedShow Answer

Choose the situation below that would result in an exothermic ?solutionH.

Correct AnswerverifiedShow Answer

Define a colloid.

Correct AnswerverifiedA colloid is a mixtu...View AnswerShow Answer

Calculate the total solution volume required to produce an osmotic pressure of 4.87 mbar using 8.21 mg of a protein with a molar mass of 4450 g mol^-1 at 25.0 °C.

Correct Answer
verified

Calculate the mass of oxygen (in mg) dissolved in a 5.00 L bucket of water exposed to a pressure of 1.13 bar of air.Assume the mole fraction of oxygen in air to be 0.21 and the Henry's law constant for oxygen in water at this temperature to be 1.3 × 10^-3 mol L^-1 bar^-1.

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

A solution of LiCl in water is 20.0 wt% LiCl.What is the mole fraction of LiCl? Assume the density of the solution is 1.00 g mL^-1.

Correct Answer
verified

Correct Answer
verified

Explain why the van't Hoff factor for MgCl₂ is less than its predicted value.

Correct Answer
verified
The hydrated Mg²⁺ and Cl^- ions ca...
View Answer

Correct Answer
verified

Calculate the vapour pressure of pure water at 85 °C if a 285 mL solution containing 173.0 g of mannose,C₆H₁₂O₆,has a vapour pressure of 545.0 mbar.

Correct Answer
verified

Correct Answer
verified

An aqueous solution is 0.387 mol L^-1 in HCl.What is the molality of the solution if the density is 1.23 g mL^-1?

Correct Answer
verified

Correct Answer
verified

A compound is found to have a molar mass of 190 g mol^-1.If 0.0673 g of the compound is dissolved in enough water to make 200 mL of solution at 25 °C,what is the osmotic pressure of the resulting solution?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

How much water must be added to 40.0 g of CaCl₂ to produce a solution that is 35.0 wt% CaCl₂?

Correct Answer
verified

Correct Answer
verified

A compound is found to have a molar mass of 598 g mol^-1.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?

Correct Answer
verified

Choose the situation below that would result in an exothermic ?_solutionH.

Correct Answer
verified

Correct Answer
verified
A colloid is a mixtu...
View Answer