Question 1

The value of ΔS° for the oxidation of solid elemental sulfur to gaseous sulfur dioxide, 
S (s,rhombic)+ O2(g)→ SO2(g)
Is ________ J/K ∙ mol.

Accepted Answer

A) +485.4 
B) +248.5 
C) -11.6 
D) -248.5 
E) +11.6 
A) +485.4 
B) +248.5 
C) -11.6 
D) -248.5 
E) +11.6

Question 2

Consider the formation of solid silver chloride from aqueous silver and chloride ions. Given the following table of thermodynamic data at 298 K:   The value of K for the reaction at 25 °C is ________.

Accepted Answer

A) 1.9 × 10-10 
B) 810 
C) 1.8 × 104 
D) 3.7 × 1010 
E) 5.3 × 109 
A) 1.9 × 10-10 
B) 810 
C) 1.8 × 104 
D) 3.7 × 1010 
E) 5.3 × 109

Question 3

The entropy of a pure crystalline substance at 0 K is zero.

Accepted Answer

A) True 
 B)False

Question 4

Which of the following statements is false?

Accepted Answer

A) The change in entropy in a system depends on the initial and final states of the system and the path taken from one state to the other. 
B) Any irreversible process results in an overall increase in entropy. 
C) The total entropy of the universe increases in any spontaneous process. 
D) Entropy increases with the number of microstates of the system. 
A) The change in entropy in a system depends on the initial and final states of the system and the path taken from one state to the other. 
B) Any irreversible process results in an overall increase in entropy. 
C) The total entropy of the universe increases in any spontaneous process. 
D) Entropy increases with the number of microstates of the system.

Question 5

Consider the reaction between ammonia and hydrochloric acid to produce ammonium chloride. Given the following table of thermodynamic data at 298 K:   The value of K for the reaction at 25 °C is ________.

Accepted Answer

A) 8.4 × 104 
B) 150 
C) 1.1 × 10-16 
D) 9.3 × 1015 
E) 1.4 × 108 
A) 8.4 × 104 
B) 150 
C) 1.1 × 10-16 
D) 9.3 × 1015 
E) 1.4 × 108

Question 6

For the reaction C2H6 (g)→ C2H4 (g)+ H2 (g)
ΔH° is +137 kJ/mol and ΔS° is +120 J/K ∙ mol.This reaction is ________.

Accepted Answer

A) spontaneous at all temperatures 
B) spontaneous only at high temperature 
C) spontaneous only at low temperature 
D) nonspontaneous at all temperatures 
A) spontaneous at all temperatures 
B) spontaneous only at high temperature 
C) spontaneous only at low temperature 
D) nonspontaneous at all temperatures

Question 7

The value of ΔS° for the oxidation of carbon to carbon monoxide, 
2C (s,graphite)+ O2 (g)→ 2CO (g)
Is ________ J/K ∙ mol.Carbon monoxide is produced in the combustion of carbon with limited oxygen.

Accepted Answer

A) -12.8 
B) +408.6 
C) -408.6 
D) +179.4 
E) +395.8 
A) -12.8 
B) +408.6 
C) -408.6 
D) +179.4 
E) +395.8

Question 8

The value of ΔG° at 25 °C for the decomposition of phosphorous trichloride into its constituent elements, 2PCl3 (g)→ P2 (g)+ 3Cl2 (g)
Is ________ kJ/mol.

Accepted Answer

A) -539.2 
B) +539.2 
C) -642.9 
D) +642.9 
E) -373.3 
A) -539.2 
B) +539.2 
C) -642.9 
D) +642.9 
E) -373.3

Question 9

The value of ΔS° for the formation of POCl3 from its constituent elements, P2 (g)+ O2 (g)+ 3Cl2 (g)→ 2POCl3 (g)
Is ________ J/K ∙ mol.

Accepted Answer

A) -442.0 
B) +771.0 
C) -321.0 
D) -771.0 
E) +321.0 
A) -442.0 
B) +771.0 
C) -321.0 
D) -771.0 
E) +321.0

Question 10

ΔS is positive for the reaction ________.

Accepted Answer

A) 2NO (g)+ O2 (g)→ 2NO2 (g) 
B) 2N2 (g)+ 3H2 (g)→ 2NH3 (g) 
C) C3H8 (g)+ 5 O2 (g)→ 3CO2 (g)+ 4 H2O (g) 
D) Mg (s)+ Cl2 (g)→ MgCl2 (s) 
E) C2H4 (g)+ H2 (g)→ C2H6 (g) 
A) 2NO (g)+ O2 (g)→ 2NO2 (g) 
B) 2N2 (g)+ 3H2 (g)→ 2NH3 (g) 
C) C3H8 (g)+ 5 O2 (g)→ 3CO2 (g)+ 4 H2O (g) 
D) Mg (s)+ Cl2 (g)→ MgCl2 (s) 
E) C2H4 (g)+ H2 (g)→ C2H6 (g)

Question 11

The value of ΔS° for the decomposition of gaseous sulfur trioxide to solid elemental sulfur and gaseous oxygen, 
2SO3 (g)→ 2S (s,rhombic)+ 3O2 (g)
Is ________ J/K ∙ mol.

Accepted Answer

A) +19.3 
B) -19.3 
C) +493.1 
D) +166.4 
E) -493.1 
A) +19.3 
B) -19.3 
C) +493.1 
D) +166.4 
E) -493.1

Question 12

The value of ΔS° for the oxidation of solid elemental sulfur to gaseous sulfur trioxide, 
2S (s,rhombic)+ 3O2(g)→ 2SO3 (g)
Is ________ J/K ∙ mol.

Accepted Answer

A) +19.3 
B) -19.3 
C) +493.1 
D) -166.4 
E) -493.1 
A) +19.3 
B) -19.3 
C) +493.1 
D) -166.4 
E) -493.1

Question 13

The vaporization of a substance at its boiling point is an isothermal process.

Accepted Answer

A) True 
 B)False

Question 14

The thermodynamic quantity that expresses the extent of randomness in a system is ________.

Accepted Answer

A) enthalpy 
B) internal energy 
C) bond energy 
D) entropy 
E) heat flow 
A) enthalpy 
B) internal energy 
C) bond energy 
D) entropy 
E) heat flow

Question 15

Which reaction produces a decrease in the entropy of the system?

Accepted Answer

A) CaCO3 (s)→ CaO (s)+ CO2 (g) 
B) 2C (s)+ O2 (g)→ 2CO (g) 
C) CO2 (s)→ CO2 (g) 
D) 2H2 (g)+ O2 (g)→ 2H2O (l) 
E) H2O (l)→ H2O (g) 
A) CaCO3 (s)→ CaO (s)+ CO2 (g) 
B) 2C (s)+ O2 (g)→ 2CO (g) 
C) CO2 (s)→ CO2 (g) 
D) 2H2 (g)+ O2 (g)→ 2H2O (l) 
E) H2O (l)→ H2O (g)

Question 16

Given the following table of thermodynamic data,   complete the following sentence.The vaporization of Ti   is ________.

Accepted Answer

A) spontaneous at all temperatures 
B) spontaneous at low temperature and nonspontaneous at high temperature 
C) nonspontaneous at low temperature and spontaneous at high temperature 
D) nonspontaneous at all temperatures 
E) not enough information given to draw a conclusion 
A) spontaneous at all temperatures 
B) spontaneous at low temperature and nonspontaneous at high temperature 
C) nonspontaneous at low temperature and spontaneous at high temperature 
D) nonspontaneous at all temperatures 
E) not enough information given to draw a conclusion

Question 17

Which one of the following is always positive when a spontaneous process occurs?

Accepted Answer

A) ΔSsystem 
B) ΔSsurroundings 
C) ΔSuniverse 
D) ΔHuniverse 
E) ΔHsurroundings 
A) ΔSsystem 
B) ΔSsurroundings 
C) ΔSuniverse 
D) ΔHuniverse 
E) ΔHsurroundings

Question 18

Which of the following has the largest entropy at   and atm?

Accepted Answer

A) Cl2 
B) F2 
C) I2 
D) Br2 
E) O3 
A) Cl2 
B) F2 
C) I2 
D) Br2 
E) O3

Question 19

Which one of the following processes produces a decrease of the entropy of the system?

Accepted Answer

A) dissolving sodium chloride in water 
B) sublimation of naphthalene 
C) dissolving oxygen in water 
D) boiling of alcohol 
E) explosion of nitroglycerine 
A) dissolving sodium chloride in water 
B) sublimation of naphthalene 
C) dissolving oxygen in water 
D) boiling of alcohol 
E) explosion of nitroglycerine

Question 20

The value of ΔH° for the decomposition of calcium chloride into its constituent elements, CaCl2 (s)→ Ca (s)+ Cl2 (g)
Is ________ kJ/mol.

Accepted Answer

A) 0.00 
B) -397.9 
C) +397.9 
D) -795.8 
E) +795.8 
A) 0.00 
B) -397.9 
C) +397.9 
D) -795.8 
E) +795.8

Exam 19: Chemical Thermodynamics

The value of ΔS° for the oxidation of solid elemental sulfur to gaseous sulfur dioxide, S (s,rhombic)+ O2(g)→ SO2(g) Is ________ J/K ∙ mol.

Consider the formation of solid silver chloride from aqueous silver and chloride ions. Given the following table of thermodynamic data at 298 K: The value of K for the reaction at 25 °C is ________.

The entropy of a pure crystalline substance at 0 K is zero.

Which of the following statements is false?

Consider the reaction between ammonia and hydrochloric acid to produce ammonium chloride. Given the following table of thermodynamic data at 298 K: The value of K for the reaction at 25 °C is ________.

For the reaction C2H6 (g)→ C2H4 (g)+ H2 (g) ΔH° is +137 kJ/mol and ΔS° is +120 J/K ∙ mol.This reaction is ________.

The value of ΔS° for the oxidation of carbon to carbon monoxide, 2C (s,graphite)+ O2 (g)→ 2CO (g) Is ________ J/K ∙ mol.Carbon monoxide is produced in the combustion of carbon with limited oxygen.

The value of ΔG° at 25 °C for the decomposition of phosphorous trichloride into its constituent elements, 2PCl3 (g)→ P2 (g)+ 3Cl2 (g) Is ________ kJ/mol.

The value of ΔS° for the formation of POCl3 from its constituent elements, P2 (g)+ O2 (g)+ 3Cl2 (g)→ 2POCl3 (g) Is ________ J/K ∙ mol.

ΔS is positive for the reaction ________.

The value of ΔS° for the decomposition of gaseous sulfur trioxide to solid elemental sulfur and gaseous oxygen, 2SO3 (g)→ 2S (s,rhombic)+ 3O2 (g) Is ________ J/K ∙ mol.

The value of ΔS° for the oxidation of solid elemental sulfur to gaseous sulfur trioxide, 2S (s,rhombic)+ 3O2(g)→ 2SO3 (g) Is ________ J/K ∙ mol.

The vaporization of a substance at its boiling point is an isothermal process.

The thermodynamic quantity that expresses the extent of randomness in a system is ________.

Which reaction produces a decrease in the entropy of the system?

Given the following table of thermodynamic data, complete the following sentence.The vaporization of Ti is ________.

Which one of the following is always positive when a spontaneous process occurs?

Which of the following has the largest entropy at and atm?

Which one of the following processes produces a decrease of the entropy of the system?

The value of ΔH° for the decomposition of calcium chloride into its constituent elements, CaCl2 (s)→ Ca (s)+ Cl2 (g) Is ________ kJ/mol.

Introduction: Matter, energy, and Measurement

Atoms, molecules, and Ions

Chemical Reactions and Reaction Stoichiometry

Reactions in Aqueous Solution

Thermochemistry

Electronic Structure of Atoms

Periodic Properties of the Elements

Basic Concepts of Chemical Bonding

Molecular Geometry and Bonding Theories

Gases

Liquids and Intermolecular Forces

Solids and Modern Materials

Properties of Solutions

Chemical Kinetics

Chemical Equilibrium

Acid-Base Equilibria

Additional Aspects of Aqueous Equilibria

Chemistry of the Environment

Electrochemistry

Nuclear Chemistry

Chemistry of the Nonmetals

Transition Metals and Coordination Chemistry

The Chemistry of Life: Organic and Biological Chemistry

Filters

The value of ΔS° for the oxidation of solid elemental sulfur to gaseous sulfur dioxide, S (s,rhombic)+ O₂(g)→ SO₂(g) Is ________ J/K ∙ mol.

For the reaction C₂H₆ (g)→ C₂H₄ (g)+ H₂ (g) ΔH° is +137 kJ/mol and ΔS° is +120 J/K ∙ mol.This reaction is ________.

The value of ΔS° for the oxidation of carbon to carbon monoxide, 2C (s,graphite)+ O₂ (g)→ 2CO (g) Is ________ J/K ∙ mol.Carbon monoxide is produced in the combustion of carbon with limited oxygen.

The value of ΔG° at 25 °C for the decomposition of phosphorous trichloride into its constituent elements, 2PCl₃ (g)→ P₂ (g)+ 3Cl₂ (g) Is ________ kJ/mol.

The value of ΔS° for the formation of POCl₃ from its constituent elements, P₂(g)+ O₂ (g)+ 3Cl₂ (g)→ 2POCl₃ (g) Is ________ J/K ∙ mol.

The value of ΔS° for the decomposition of gaseous sulfur trioxide to solid elemental sulfur and gaseous oxygen, 2SO₃ (g)→ 2S (s,rhombic)+ 3O₂ (g) Is ________ J/K ∙ mol.

The value of ΔS° for the oxidation of solid elemental sulfur to gaseous sulfur trioxide, 2S (s,rhombic)+ 3O₂(g)→ 2SO₃ (g) Is ________ J/K ^∙ mol.

The value of ΔH° for the decomposition of calcium chloride into its constituent elements, CaCl₂ (s)→ Ca (s)+ Cl₂ (g) Is ________ kJ/mol.