Question 1

Procaine hydrochloride (  
= 272.77 g/mol)is used as a local anesthetic.Calculate the molarity of a 4.666 m solution which has a density of 1.1066 g/mL.

Accepted Answer

A) 2.272 M 
B) 4.056 M 
C) 4.216 M 
D) 4.666 M 
E) None of these choices is correct. 
A) 2.272 M 
B) 4.056 M 
C) 4.216 M 
D) 4.666 M 
E) None of these choices is correct.

Question 2

A 0.100 m MgSO4 solution has a freezing point of -0.23°C.What is the van't Hoff factor for this solution?
Kf = 1.86°C/m

Accepted Answer

A) 0.62 
B) 1.0 
C) 1.2 
D) 2.0 
E) 4.0 
A) 0.62 
B) 1.0 
C) 1.2 
D) 2.0 
E) 4.0

Question 3

Children under the age of six with more than 0.10 ppm of lead in their blood can suffer a reduction in I.Q.or have behavior problems.What is the molality of a solution which contains 0.10 ppm of lead?

Accepted Answer

A) 4.8 $\times$ 10-10 m 
B) 4.8 $\times$ 10-7 m 
C) 4.8 $\times$ 10-4 m 
D) 4.8 $\times$ 10-1 m 
E) None of these choices is correct. 
A) 4.8 $\times$ 10-10 m 
B) 4.8 $\times$ 10-7 m 
C) 4.8 $\times$ 10-4 m 
D) 4.8 $\times$ 10-1 m 
E) None of these choices is correct.

Question 4

Potassium hydrogen phosphate is used in the preparation of non-dairy powdered creamers.Calculate the molarity of a solution prepared by dissolving 238 g of K2HPO4 in enough water to produce 275 mL of solution.

Accepted Answer

A) 0.732 M 
B) 0.865 M 
C) 2.66 M 
D) 4.97 M 
E) None of these choices is correct. 
A) 0.732 M 
B) 0.865 M 
C) 2.66 M 
D) 4.97 M 
E) None of these choices is correct.

Question 5

Benzaldehyde (  
= 106.1 g/mol),also known as oil of almonds,is used in the manufacture of dyes and perfumes and in flavorings.What would be the freezing point of a solution prepared by dissolving 75.00 g of benzaldehyde in 850.0 g of ethanol? Kf = 1.99°C/m,freezing point of pure ethanol = -117.3°C.

Accepted Answer

A) -117.5°C 
B) -118.7°C 
C) -119.0°C 
D) -120.6°C 
E) < -121°C 
A) -117.5°C 
B) -118.7°C 
C) -119.0°C 
D) -120.6°C 
E) < -121°C

Question 6

Diethyl ether has a vapor pressure of 400.0 torr at 18°C.When a sample of benzoic acid is dissolved in ether,the vapor pressure of the solution is 342 torr.What is the mole fraction of benzoic acid in the solution?

Accepted Answer

A) 0.0169 
B) 0.0197 
C) 0.145 
D) 0.855 
E) None of these choices is correct. 
A) 0.0169 
B) 0.0197 
C) 0.145 
D) 0.855 
E) None of these choices is correct.

Question 7

Predict the van't Hoff factor (i)for each of the following solutes:
a.CaCl2
 b.Fe2(SO4)3
 c.NH4Cl

Accepted Answer

Question 8

Calculate the vapor pressure of a solution prepared by dissolving 0.500 mol of a non-volatile solute in 275 g of hexane (  
= 86.18 g/mol)at 49.6°C.P°hexane = 400.0 torr at 49.6°C.

Accepted Answer

A) 54 torr 
B) 154 torr 
C) 246 torr 
D) 346 torr 
E) 400.torr 
A) 54 torr 
B) 154 torr 
C) 246 torr 
D) 346 torr 
E) 400.torr

Question 9

Aqueous ammonia is commercially available in a solution that is 28% (w/w)ammonia.What is the mole fraction of ammonia in such a solution?

Accepted Answer

A) 0.017 
B) 0.023 
C) 0.012 
D) 0.24 
E) 0.29 
A) 0.017 
B) 0.023 
C) 0.012 
D) 0.24 
E) 0.29

Question 10

Octane and nonane are liquids which are components of gasoline.Their vapor pressures at 25°C are 13.9 torr and 4.7 torr,respectively.What is the vapor pressure of a mixture consisting of 1 mole of each of these compounds?

Accepted Answer

The answer of Octane and nonane are liquids which are...

Question 11

From the following list of aqueous solutions and water,select the one with the highest boiling point.

Accepted Answer

A) 1.0 M KNO3 
B) 0.75 M NaCl 
C) 0.75 M CuCl2 
D) 2.0 M C12H22O11 (sucrose) 
E) pure water 
A) 1.0 M KNO3 
B) 0.75 M NaCl 
C) 0.75 M CuCl2 
D) 2.0 M C12H22O11 (sucrose) 
E) pure water

Question 12

Copper(II)bromide is used as a wood preservative.What mass of CuBr2 is needed to prepare 750.0 mL of a 1.25 M solution?

Accepted Answer

A) 134 g 
B) 209 g 
C) 372 g 
D) 938 g 
E) > 1 kg 
A) 134 g 
B) 209 g 
C) 372 g 
D) 938 g 
E) > 1 kg

Question 13

Isoamyl salicylate (  
= 208.25 g/mol)has a pleasant aroma and is used in perfumes and soaps.Which of the following combinations gives a 0.75 m solution of isoamyl salicylate in ethyl alcohol (d = 0.7893 g/mL)?

Accepted Answer

A) 117.2 g isoamyl salicylate in 950.0 mL of ethyl alcohol 
B) 117.2 g isoamyl salicylate in 750.0 mL of ethyl alcohol 
C) 117.2 g isoamyl salicylate in 750.0 mL of solution 
D) 117.2 g isoamyl salicylate in 592.0 g of ethyl alcohol 
E) None of these choices is correct. 
A) 117.2 g isoamyl salicylate in 950.0 mL of ethyl alcohol 
B) 117.2 g isoamyl salicylate in 750.0 mL of ethyl alcohol 
C) 117.2 g isoamyl salicylate in 750.0 mL of solution 
D) 117.2 g isoamyl salicylate in 592.0 g of ethyl alcohol 
E) None of these choices is correct.

Question 14

How many moles of bromide ions are present in 750.0 mL of 1.35 M MgBr2?

Accepted Answer

A) 0.506 mol 
B) 1.01 mol 
C) 2.03 mol 
D) 3.04 mol 
E) None of these choices is correct. 
A) 0.506 mol 
B) 1.01 mol 
C) 2.03 mol 
D) 3.04 mol 
E) None of these choices is correct.

Question 15

Lysine is an amino acid that is an essential part of nutrition but which is not synthesized by the human body.What is the molar mass of lysine if 750.0 mL of a solution containing 8.60 g of lysine has an osmotic pressure of 1.918 atm?
T = 25.0°C

Accepted Answer

A) 110.g/mol 
B) 146 g/mol 
C) 220.g/mol 
D) 1340 g/mol 
E) 1780 g/mol 
A) 110.g/mol 
B) 146 g/mol 
C) 220.g/mol 
D) 1340 g/mol 
E) 1780 g/mol

Question 16

How many moles of sulfate ions are present in 1.0 L of 0.5 M Li2SO4?

Accepted Answer

A) 0.5 mol 
B) 1.0 mol 
C) 1.5 mol 
D) 2.0 mol 
E) 3.0 mol 
A) 0.5 mol 
B) 1.0 mol 
C) 1.5 mol 
D) 2.0 mol 
E) 3.0 mol

Question 17

A 0.100 m K2SO4 solution has a freezing point of -0.43°C.What is the van't Hoff factor for this solution?
Kf = 1.86°C/m

Accepted Answer

A) 0.77 
B) 1.0 
C) 2.3 
D) 3.0 
E) >3.0 
A) 0.77 
B) 1.0 
C) 2.3 
D) 3.0 
E) >3.0

Question 18

Cadmium bromide is used in photography and lithography.Calculate the molality of a solution prepared by dissolving 45.38 g of CdBr2 in 375.0 g of water.

Accepted Answer

A) 0.03035 m 
B) 0.01600 m 
C) 0.1210 m 
D) 0.4446 m 
E) None of these choices is correct. 
A) 0.03035 m 
B) 0.01600 m 
C) 0.1210 m 
D) 0.4446 m 
E) None of these choices is correct.

Question 19

A 2.0% (w/v)solution of sodium hydrogen citrate,Na2C6H6O7,which also contains 2.5% (w/v)of dextrose,C6H12O6,is used as an anticoagulant for blood which is to be used for transfusions.What is the molarity of the sodium hydrogen citrate in the solution?

Accepted Answer

A) 0.085 M 
B) 0.19 M 
C) 0.53 M 
D) 1.2 M 
E) 1.3 M 
A) 0.085 M 
B) 0.19 M 
C) 0.53 M 
D) 1.2 M 
E) 1.3 M

Question 20

Carbon tetrachloride,once widely used in fire extinguishers and as a dry cleaning fluid,has been found to cause liver damage to those exposed to its vapors over long periods of time.What is the boiling point of a solution prepared by dissolving 375 g of sulfur (S8,  
= 256.5g/mol)in 1250 g of CCl4? Kb = 5.05°C/m,boiling point of pure CCl4 = 76.7°C?

Accepted Answer

A) 70.8°C 
B) 75.2°C 
C) 78.2°C 
D) 82.6°C 
E) >85°C 
A) 70.8°C 
B) 75.2°C 
C) 78.2°C 
D) 82.6°C 
E) >85°C

Exam 13: The Properties of Solutions

Procaine hydrochloride ( = 272.77 g/mol)is used as a local anesthetic.Calculate the molarity of a 4.666 m solution which has a density of 1.1066 g/mL.

A 0.100 m MgSO4 solution has a freezing point of -0.23°C.What is the van't Hoff factor for this solution? Kf = 1.86°C/m

Children under the age of six with more than 0.10 ppm of lead in their blood can suffer a reduction in I.Q.or have behavior problems.What is the molality of a solution which contains 0.10 ppm of lead?

Potassium hydrogen phosphate is used in the preparation of non-dairy powdered creamers.Calculate the molarity of a solution prepared by dissolving 238 g of K2HPO4 in enough water to produce 275 mL of solution.

Diethyl ether has a vapor pressure of 400.0 torr at 18°C.When a sample of benzoic acid is dissolved in ether,the vapor pressure of the solution is 342 torr.What is the mole fraction of benzoic acid in the solution?

Predict the van't Hoff factor (i)for each of the following solutes: a.CaCl2 b.Fe2(SO4)3 c.NH4Cl

Calculate the vapor pressure of a solution prepared by dissolving 0.500 mol of a non-volatile solute in 275 g of hexane ( = 86.18 g/mol)at 49.6°C.P°hexane = 400.0 torr at 49.6°C.

Aqueous ammonia is commercially available in a solution that is 28% (w/w)ammonia.What is the mole fraction of ammonia in such a solution?

Octane and nonane are liquids which are components of gasoline.Their vapor pressures at 25°C are 13.9 torr and 4.7 torr,respectively.What is the vapor pressure of a mixture consisting of 1 mole of each of these compounds?

From the following list of aqueous solutions and water,select the one with the highest boiling point.

Copper(II)bromide is used as a wood preservative.What mass of CuBr2 is needed to prepare 750.0 mL of a 1.25 M solution?

Isoamyl salicylate ( = 208.25 g/mol)has a pleasant aroma and is used in perfumes and soaps.Which of the following combinations gives a 0.75 m solution of isoamyl salicylate in ethyl alcohol (d = 0.7893 g/mL)?

How many moles of bromide ions are present in 750.0 mL of 1.35 M MgBr2?

Lysine is an amino acid that is an essential part of nutrition but which is not synthesized by the human body.What is the molar mass of lysine if 750.0 mL of a solution containing 8.60 g of lysine has an osmotic pressure of 1.918 atm? T = 25.0°C

How many moles of sulfate ions are present in 1.0 L of 0.5 M Li2SO4?

A 0.100 m K2SO4 solution has a freezing point of -0.43°C.What is the van't Hoff factor for this solution? Kf = 1.86°C/m

Cadmium bromide is used in photography and lithography.Calculate the molality of a solution prepared by dissolving 45.38 g of CdBr2 in 375.0 g of water.

A 2.0% (w/v)solution of sodium hydrogen citrate,Na2C6H6O7,which also contains 2.5% (w/v)of dextrose,C6H12O6,is used as an anticoagulant for blood which is to be used for transfusions.What is the molarity of the sodium hydrogen citrate in the solution?

Keys to the Study of Chemistry

The Components of Matter

Stoichiometry of Formulas and Equations

Three Major Classes of Chemical Reactions

Gases and the Kinetic-Molecular Theory

Thermochemistry: Energy Flow and Chemical Change

Quantum Theory and Atomic Structure

Electron Configuration and Chemical Periodicity

Models of Chemical Bonding

The Shapes of Molecules

Theories of Covalent Bonding

Intermolecular Forces: Liquids,solids,and Phase Changes

The Main-Group Elements: Applying Principles of Bonding and Structure

Organic Compounds and the Atomic Properties of Carbon

Kinetics: Rates and Mechanisms of Chemical Reactions

Equilibrium: the Extent of Chemical Reactions

Acid-Base Equilibria

Ionic Equilibria in Aqueous Systems

Thermodynamics: Entropy, free Energy, and the Direction of Chemical Reactions

Electrochemistry: Chemical Change and Electrical Work

The Transition Elements and Their Coordination Compounds

Nuclear Reactions and Their Applications

Filters

A 0.100 m MgSO₄ solution has a freezing point of -0.23°C.What is the van't Hoff factor for this solution? K_f = 1.86°C/m

Potassium hydrogen phosphate is used in the preparation of non-dairy powdered creamers.Calculate the molarity of a solution prepared by dissolving 238 g of K₂HPO₄ in enough water to produce 275 mL of solution.

Predict the van't Hoff factor (i)for each of the following solutes: a.CaCl₂ b.Fe₂(SO₄)₃ c.NH₄Cl

Calculate the vapor pressure of a solution prepared by dissolving 0.500 mol of a non-volatile solute in 275 g of hexane ( = 86.18 g/mol)at 49.6°C.P°_hexane = 400.0 torr at 49.6°C.

Copper(II)bromide is used as a wood preservative.What mass of CuBr₂ is needed to prepare 750.0 mL of a 1.25 M solution?

How many moles of bromide ions are present in 750.0 mL of 1.35 M MgBr₂?

How many moles of sulfate ions are present in 1.0 L of 0.5 M Li₂SO₄?

A 0.100 m K₂SO₄ solution has a freezing point of -0.43°C.What is the van't Hoff factor for this solution? K_f = 1.86°C/m

Cadmium bromide is used in photography and lithography.Calculate the molality of a solution prepared by dissolving 45.38 g of CdBr₂ in 375.0 g of water.

A 2.0% (w/v)solution of sodium hydrogen citrate,Na₂C₆H₆O₇,which also contains 2.5% (w/v)of dextrose,C₆H₁₂O₆,is used as an anticoagulant for blood which is to be used for transfusions.What is the molarity of the sodium hydrogen citrate in the solution?