Question 1

At 300 K a 500.0 mL solution containing 0.4314 g of dextrose has an osmotic pressure of 89.6 mm Hg.What is the molar mass of dextrose?

Accepted Answer

The answer of At 300 K a 500.0 mL solution...

Question 2

In which case should CO2(g)be more soluble in water?

Accepted Answer

A) The total pressure is 5 atm and the partial pressure of CO2 is 0.5 atm. 
B) The total pressure is 3 atm and the partial pressure of CO2 is 1 atm. 
C) The total pressure is 1 atm and the partial pressure of CO2 is 0.03 atm. 
D) The total pressure is 1 atm and the partial pressure of CO2 is 0.4 atm. 
A) The total pressure is 5 atm and the partial pressure of CO2 is 0.5 atm. 
B) The total pressure is 3 atm and the partial pressure of CO2 is 1 atm. 
C) The total pressure is 1 atm and the partial pressure of CO2 is 0.03 atm. 
D) The total pressure is 1 atm and the partial pressure of CO2 is 0.4 atm.

Question 3

Sodium hydroxide is available commercially as a 50.0% by weight aqueous solution.Calculate the molality of this sodium hydroxide solution.

Accepted Answer

A) 0)450 m 
B) 19.1 m 
C) 25.0 m 
D) 125.m 
A) 0)450 m 
B) 19.1 m 
C) 25.0 m 
D) 125.m

Question 4

What volume of 3.00 M CH3OH solution is needed to provide 0.270 mol of CH3OH?

Accepted Answer

A) 1)23 mL 
B) 11.1 mL 
C) 90.0 mL 
D) 810 mL 
A) 1)23 mL 
B) 11.1 mL 
C) 90.0 mL 
D) 810 mL

Question 5

Aqueous solutions of 30.0% (by weight)hydrogen peroxide,H2O2,are used to oxidize metals or organic molecules in chemical reactions.Calculate the molality of this solution.

Accepted Answer

A) 0)974 m 
B) 6)78 m 
C) 9)79 m 
D) 12.6 m 
A) 0)974 m 
B) 6)78 m 
C) 9)79 m 
D) 12.6 m

Question 6

What is the freezing point of a solution of 1.43 g MgCl2 in 100 g of water? Kf for water is 1.86°C/m for water.

Accepted Answer

A) -0.0279°C 
B) -0.279°C 
C) -0.559°C 
D) -0.838°C 
A) -0.0279°C 
B) -0.279°C 
C) -0.559°C 
D) -0.838°C

Question 7

What is the mole fraction of I2 in a solution made by dissolving 27.8 g of I2 in 245 g of hexane,C6H14?

Accepted Answer

A) 0)0371 
B) 0)0385 
C) 0)0715 
D) 0)0770 
A) 0)0371 
B) 0)0385 
C) 0)0715 
D) 0)0770

Question 8

The average osmotic pressure of blood is about 7 atm.Therefore

Accepted Answer

A) the average blood pressure is about 7 atm. 
B) the average pressure inside the body is about 7 atm above the external pressure. 
C) a pressure of about 7 atm would be required to prevent osmosis if blood is in contact with pure water across a semipermeable membrane. 
D) All of these are true. 
A) the average blood pressure is about 7 atm. 
B) the average pressure inside the body is about 7 atm above the external pressure. 
C) a pressure of about 7 atm would be required to prevent osmosis if blood is in contact with pure water across a semipermeable membrane. 
D) All of these are true.

Question 9

A solution is prepared by dissolving 171 g of CdCl2 in enough water to make exactly 250.0 mL of solution.If the density of the solution is 1.556 g/mL,what is the weight percent of CdCl2 in the solution?

Accepted Answer

A) 7)17% 
B) 44.0% 
C) 56.0% 
D) 68.4% 
A) 7)17% 
B) 44.0% 
C) 56.0% 
D) 68.4%

Question 10

A phase diagram of temperature versus composition for a mixture of the two volatile liquids octane
(bp = 69°C)and decane (bp = 126°C)is shown.  
-Assume that you start with a mixture containing 0.80 mol of decane and 0.20 mol of octane,what region of the diagram corresponds to vapor?

Accepted Answer

A) region a 
B) region b 
C) region c 
D) regions a and c 
A) region a 
B) region b 
C) region c 
D) regions a and c

Question 11

The following diagram shows a close-up view of the vapor pressure curves for a pure solvent and a solution containing a nonvolatile solute dissolved in this solvent.  
-Which curve is the solvent and what happens to the boiling point when the solute is dissolved in the solvent?

Accepted Answer

A) Curve (a)is the solvent and the boiling point decreases. 
B) Curve (a)is the solvent and the boiling point increases. 
C) Curve (b)is the solvent and the boiling point decreases. 
D) Curve (b)is the solvent and the boiling point increases. 
A) Curve (a)is the solvent and the boiling point decreases. 
B) Curve (a)is the solvent and the boiling point increases. 
C) Curve (b)is the solvent and the boiling point decreases. 
D) Curve (b)is the solvent and the boiling point increases.

Question 12

If dissociation of MgCl2 in water were 100%,the van't Hoff factor would be ________;however,for real solutions the van't Hoff factor for MgCl2 is ________ (greater than,less than)this value.

Accepted Answer

Question 13

Which is not a solution?

Accepted Answer

A) brass 
B) fog 
C) hydrochloric acid 
D) wine 
A) brass 
B) fog 
C) hydrochloric acid 
D) wine

Question 14

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 15

A saturated solution is defined as

Accepted Answer

A) a concentrated solution. 
B) a solution that is in equilibrium with pure solvent. 
C) a solution than is in equilibrium with undissolved solute. 
D) a solution that is in equilibrium with both pure solvent and undissolved solute. 
A) a concentrated solution. 
B) a solution that is in equilibrium with pure solvent. 
C) a solution than is in equilibrium with undissolved solute. 
D) a solution that is in equilibrium with both pure solvent and undissolved solute.

Question 16

A solution is prepared by dissolving 40.0 g of sucrose,C12H22O11,in 250.g of water at 25°C.What is the vapor pressure of the solution if the vapor pressure of water at 25°C is 23.76 mm Hg?

Accepted Answer

A) 0)198 mm Hg 
B) 20.5 mm Hg 
C) 23.6 mm Hg 
D) 24.0 mm Hg 
A) 0)198 mm Hg 
B) 20.5 mm Hg 
C) 23.6 mm Hg 
D) 24.0 mm Hg

Question 17

In a solution that is 55% ethyl alcohol and 45% water,the solute is ________ and the solvent is ________.

Accepted Answer

The answer of In a solution that is 55% ethyl...

Question 18

What is the molality of ethanol in a solution made by dissolving 14.6 g of ethanol,C2H5OH,in 53.6 g of water?

Accepted Answer

A) 0)00591 m 
B) 0)272 m 
C) 5)91 m 
D) 272 m 
A) 0)00591 m 
B) 0)272 m 
C) 5)91 m 
D) 272 m

Question 19

Amphetamines in urine can be confirmed by mass spectroscopy at a concentration of 500 ng/mL.Assuming a urine density of 1.025 g/mL,what is this concentration in parts per million?

Accepted Answer

The answer of Amphetamines in urine can be confirmed by...

Question 20

In which case should CO2(g)be more soluble in water?

Accepted Answer

A) The total pressure is 5 atm and the partial pressure of CO2 is 1 atm. 
B) The total pressure is 3 atm and the partial pressure of CO2 is 2 atm. 
C) The total pressure is 1 atm and the partial pressure of CO2 is 0.03 atm. 
D) The total pressure is 1 atm and the partial pressure of CO2 is 0.5 atm. 
A) The total pressure is 5 atm and the partial pressure of CO2 is 1 atm. 
B) The total pressure is 3 atm and the partial pressure of CO2 is 2 atm. 
C) The total pressure is 1 atm and the partial pressure of CO2 is 0.03 atm. 
D) The total pressure is 1 atm and the partial pressure of CO2 is 0.5 atm.

Exam 11: Solutions and Their Properties

At 300 K a 500.0 mL solution containing 0.4314 g of dextrose has an osmotic pressure of 89.6 mm Hg.What is the molar mass of dextrose?

In which case should CO2(g)be more soluble in water?

Sodium hydroxide is available commercially as a 50.0% by weight aqueous solution.Calculate the molality of this sodium hydroxide solution.

What volume of 3.00 M CH3OH solution is needed to provide 0.270 mol of CH3OH?

Aqueous solutions of 30.0% (by weight)hydrogen peroxide,H2O2,are used to oxidize metals or organic molecules in chemical reactions.Calculate the molality of this solution.

What is the freezing point of a solution of 1.43 g MgCl2 in 100 g of water? Kf for water is 1.86°C/m for water.

What is the mole fraction of I2 in a solution made by dissolving 27.8 g of I2 in 245 g of hexane,C6H14?

The average osmotic pressure of blood is about 7 atm.Therefore

A solution is prepared by dissolving 171 g of CdCl2 in enough water to make exactly 250.0 mL of solution.If the density of the solution is 1.556 g/mL,what is the weight percent of CdCl2 in the solution?

A phase diagram of temperature versus composition for a mixture of the two volatile liquids octane (bp = 69°C)and decane (bp = 126°C)is shown. -Assume that you start with a mixture containing 0.80 mol of decane and 0.20 mol of octane,what region of the diagram corresponds to vapor?

The following diagram shows a close-up view of the vapor pressure curves for a pure solvent and a solution containing a nonvolatile solute dissolved in this solvent. -Which curve is the solvent and what happens to the boiling point when the solute is dissolved in the solvent?

If dissociation of MgCl2 in water were 100%,the van't Hoff factor would be ________;however,for real solutions the van't Hoff factor for MgCl2 is ________ (greater than,less than)this value.

Which is not a 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?

A saturated solution is defined as

A solution is prepared by dissolving 40.0 g of sucrose,C12H22O11,in 250.g of water at 25°C.What is the vapor pressure of the solution if the vapor pressure of water at 25°C is 23.76 mm Hg?

In a solution that is 55% ethyl alcohol and 45% water,the solute is ________ and the solvent is ________.

What is the molality of ethanol in a solution made by dissolving 14.6 g of ethanol,C2H5OH,in 53.6 g of water?

Amphetamines in urine can be confirmed by mass spectroscopy at a concentration of 500 ng/mL.Assuming a urine density of 1.025 g/mL,what is this concentration in parts per million?

In which case should CO2(g)be more soluble in water?

Chemistry: Matter and Measurement

Atoms, molecules, and Ions

Formulas, equations, and Moles

Reactions in Aqueous Solutions

Periodicity and the Atomic Structure of Atoms

Ionic Bonds and Some Main-Group Chemistry

Covalent Bonds and Molecular Structure

Thermochemistry: Chemical Energy

Gases: Their Properties and Behavior

Liquids,solids,and Phase Changes

Chemical Kinetics

Chemical Equilibrium

Aqueous Equilibria: Acids and Bases

Applications of Aqueous Equilibria

Thermodynamics: Entropy, free Energy, and Equilibrium

Electrochemistry

Hydrogen, oxygen, and Water

The Main-Group Elements

Transition Elements and Coordination Chemistry

Metals and Solid-State Materials

Nuclear Chemistry

Organic and Biological Chemistry

Filters

In which case should CO₂(g)be more soluble in water?

What volume of 3.00 M CH₃OH solution is needed to provide 0.270 mol of CH₃OH?

Aqueous solutions of 30.0% (by weight)hydrogen peroxide,H₂O₂,are used to oxidize metals or organic molecules in chemical reactions.Calculate the molality of this solution.

What is the freezing point of a solution of 1.43 g MgCl₂ in 100 g of water? K_f for water is 1.86°C/m for water.

What is the mole fraction of I₂ in a solution made by dissolving 27.8 g of I₂ in 245 g of hexane,C₆H₁₄?

A solution is prepared by dissolving 171 g of CdCl₂ in enough water to make exactly 250.0 mL of solution.If the density of the solution is 1.556 g/mL,what is the weight percent of CdCl₂ in the solution?

If dissociation of MgCl₂ in water were 100%,the van't Hoff factor would be ;however,for real solutions the van't Hoff factor for MgCl₂ is (greater than,less than)this value.

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?

A solution is prepared by dissolving 40.0 g of sucrose,C₁₂H₂₂O₁₁,in 250.g of water at 25°C.What is the vapor pressure of the solution if the vapor pressure of water at 25°C is 23.76 mm Hg?

In a solution that is 55% ethyl alcohol and 45% water,the solute is and the solvent is .

What is the molality of ethanol in a solution made by dissolving 14.6 g of ethanol,C₂H₅OH,in 53.6 g of water?

In which case should CO₂(g)be more soluble in water?