Question 1

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

Accepted Answer

A) True 
 B)False

Question 2

Use the table below to answer the questions that follow.
Thermodynamic Quantities for Selected Substances at 298.15 K (25°C)  
-The value of ΔG°at 25 °C for the decomposition of phosphorous trichloride into its constituent elements,   is kJ/mol.

Accepted Answer

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

Question 3

The quantity of energy gained by a system equals the quantity of energy gained by its surroundings.

Accepted Answer

A) True 
 B)False

Question 4

Use the table below to answer the questions that follow.
Thermodynamic Quantities for Selected Substances at 298.15 K (25°C)  
-The value of ΔH° for the decomposition of calcium chloride into its constituent elements,   is kJ/mol.

Accepted Answer

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

Question 5

The equilibrium position corresponds to which letter on the graph of G vs f (course of reaction) below?

Accepted Answer

A)  A 
B)  B 
C)  C 
D)  D 
E)  E 
A)  A 
B)  B 
C)  C 
D)  D 
E)  E

Question 6

Use the table below to answer the questions that follow.
Thermodynamic Quantities for Selected Substances at 298.15 K (25°C)  
-The value of ΔS° for the decomposition of gaseous sulfur trioxide to solid elemental sulfur and gaseous oxygen,   is J/K.

Accepted Answer

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

Question 7

The thermodynamic quantity that expresses the degree of disorder in a system is _ _.

Accepted Answer

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

Question 8

Use the table below to answer the questions that follow.
   Thermodynamic Quantities for Selected Substances at 298.15 K (25°C)  
-The combustion of ethane in the presence of excess oxygen yields carbon dioxide and water:
 
The value of OSo for this reaction is J/K.

Accepted Answer

A)  - 620.9 
B)  - 151.0 
C)  - 718.0 
D)  +718.0 
E)  +151.0 
A)  - 620.9 
B)  - 151.0 
C)  - 718.0 
D)  +718.0 
E)  +151.0

Question 9

The standard Gibbs free energy of formation of is zero.
(a) H2O (l)
(b) O (g)
(c) H2 (g)

Accepted Answer

A)  (a) only 
B)  (b) only 
C)  (c) only 
D)  (b) and (c) 
E)  (a), (b), and (c) 
A)  (a) only 
B)  (b) only 
C)  (c) only 
D)  (b) and (c) 
E)  (a), (b), and (c)

Question 10

Use the table below to answer the questions that follow.
Thermodynamic Quantities for Selected Substances at 298.15 K (25°C)  
-The value of ΔG° at 25 °C for the oxidation of solid elemental sulfur to gaseous sulfur dioxide,   is kJ/mol.

Accepted Answer

A)  - 300.4 
B)  +300.4 
C)  +269.9 
D)  - 269.9 
E)  +395.2 
A)  - 300.4 
B)  +300.4 
C)  +269.9 
D)  - 269.9 
E)  +395.2

Question 11

Which one of the following statements is true about the equilibrium constant for a reaction if ΔG° for the reaction is negative?

Accepted Answer

A) K = 1 B) K > 1 C) K < 1 D) K = 0 E) More information is needed. A) K = 1 B) K > 1 C) K < 1 D) K = 0 E) More information is needed.

Question 12

Use the table below to answer the questions that follow.
Thermodynamic Quantities for Selected Substances at 298.15 K (25°C)  
-The value of ΔG° at 25 °C for the formation of POCl3 from its constituent elements,   is kJ/mol.

Accepted Answer

A)  - 606.2 
B)  - 1,005 
C)  +606.2 
D)  - 1,109 
E)  +1,109 
A)  - 606.2 
B)  - 1,005 
C)  +606.2 
D)  - 1,109 
E)  +1,109

Question 13

Use the table below to answer the questions that follow.
Thermodynamic Quantities for Selected Substances at 298.15 K (25°C)  
-The value of ΔS° for the decomposition of POCl3 into its constituent elements,   is J/K.

Accepted Answer

A)  +771 
B)  - 321 
C)  +442 
D)  +321 
E)  - 771 
A)  +771 
B)  - 321 
C)  +442 
D)  +321 
E)  - 771

Question 14

Calculate OG○for the autoionization of water at 25○C. Kw = 1.0 × 10- 14

Accepted Answer

Question 15

Use the table below to answer the questions that follow.
Thermodynamic Quantities for Selected Substances at 298.15 K (25°C)  
-The value of ΔH° for the oxidation of solid elemental sulfur to gaseous sulfur dioxide,   is kJ/mol.

Accepted Answer

A)  - 269.9 
B)  +11.6 
C)  - 11.6 
D)  +269.9 
E)  +0.00 
A)  - 269.9 
B)  +11.6 
C)  - 11.6 
D)  +269.9 
E)  +0.00

Question 16

Use the table below to answer the questions that follow.
Thermodynamic Quantities for Selected Substances at 298.15 K (25°C)  
-Consider the reaction:
 
Given the following table of thermodynamic data at 298 oK:
 
The value K for the reaction at 25 °C is .

Accepted Answer

A)  3.8 × 10- 14 
B)  5.9 × 104 
C)  7.1 × 1085 
D)  8.1 × 1019 
E)  370 
A)  3.8 × 10- 14 
B)  5.9 × 104 
C)  7.1 × 1085 
D)  8.1 × 1019 
E)  370

Question 17

Use the table below to answer the questions that follow.
Thermodynamic Quantities for Selected Substances at 298.15 K (25°C)  
-The value of ΔS° for the oxidation of solid elemental sulfur to gaseous sulfur trioxide,   is J/K.

Accepted Answer

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

Question 18

Find the temperature above which a reaction with a OH of 53 .00 kJ/mol and a OS of 100.0 J/K·mol becomes spontaneous.

Accepted Answer

The answer of Find the temperature above which a reaction...

Question 19

Use the table below to answer the questions that follow.
   Thermodynamic Quantities for Selected Substances at 298.15 K (25°C)  
-The value of ΔS° for the oxidation of carbon to carbon monoxide, 2C (s, graphite) + O2 (g) -2CO (g)
Is J/K. Carbon monoxide is produced in the combustion of carbon with limited oxygen.

Accepted Answer

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

Question 20

For an isothermal process, OS = .

Accepted Answer

A)  Tqrev  
B)  q 
C)  qrev/T 
D)  q + w 
E)  qrev 
A)  Tqrev  
B)  q 
C)  qrev/T 
D)  q + w 
E)  qrev

Exam 19: Chemical Thermodynamics

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

Use the table below to answer the questions that follow. Thermodynamic Quantities for Selected Substances at 298.15 K (25°C) -The value of ΔG°at 25 °C for the decomposition of phosphorous trichloride into its constituent elements, is kJ/mol.

The quantity of energy gained by a system equals the quantity of energy gained by its surroundings.

Use the table below to answer the questions that follow. Thermodynamic Quantities for Selected Substances at 298.15 K (25°C) -The value of ΔH° for the decomposition of calcium chloride into its constituent elements, is kJ/mol.

The equilibrium position corresponds to which letter on the graph of G vs f (course of reaction) below?

Use the table below to answer the questions that follow. Thermodynamic Quantities for Selected Substances at 298.15 K (25°C) -The value of ΔS° for the decomposition of gaseous sulfur trioxide to solid elemental sulfur and gaseous oxygen, is J/K.

The thermodynamic quantity that expresses the degree of disorder in a system is _ _.

Use the table below to answer the questions that follow. Thermodynamic Quantities for Selected Substances at 298.15 K (25°C) -The combustion of ethane in the presence of excess oxygen yields carbon dioxide and water: The value of OSo for this reaction is J/K.

The standard Gibbs free energy of formation of is zero. (a) H2O (l) (b) O (g) (c) H2 (g)

Use the table below to answer the questions that follow. Thermodynamic Quantities for Selected Substances at 298.15 K (25°C) -The value of ΔG° at 25 °C for the oxidation of solid elemental sulfur to gaseous sulfur dioxide, is kJ/mol.

Which one of the following statements is true about the equilibrium constant for a reaction if ΔG° for the reaction is negative?

Use the table below to answer the questions that follow. Thermodynamic Quantities for Selected Substances at 298.15 K (25°C) -The value of ΔG° at 25 °C for the formation of POCl3 from its constituent elements, is kJ/mol.

Use the table below to answer the questions that follow. Thermodynamic Quantities for Selected Substances at 298.15 K (25°C) -The value of ΔS° for the decomposition of POCl3 into its constituent elements, is J/K.

Calculate OG○for the autoionization of water at 25○C. Kw = 1.0 × 10- 14

Use the table below to answer the questions that follow. Thermodynamic Quantities for Selected Substances at 298.15 K (25°C) -The value of ΔH° for the oxidation of solid elemental sulfur to gaseous sulfur dioxide, is kJ/mol.

Use the table below to answer the questions that follow. Thermodynamic Quantities for Selected Substances at 298.15 K (25°C) -Consider the reaction: Given the following table of thermodynamic data at 298 oK: The value K for the reaction at 25 °C is .

Use the table below to answer the questions that follow. Thermodynamic Quantities for Selected Substances at 298.15 K (25°C) -The value of ΔS° for the oxidation of solid elemental sulfur to gaseous sulfur trioxide, is J/K.

Find the temperature above which a reaction with a OH of 53 .00 kJ/mol and a OS of 100.0 J/K·mol becomes spontaneous.

For an isothermal process, OS = .

Introduction: Matter and Measurement

Atoms, Molecules, and Ions

Stoichiometry: Calculations With Chemical Formulas and Equations

Aqueous Reactions and Solution Stoichiometry

Electronic Structure of Atoms

Periodic Properties of the Elements

Basic Concepts of Chemical Bonding

Gases

Intermolecular Forces, Liquids, and Solids

Modern Materials

Properties of Solutions

Chemical Kinetics

Chemical Equilibrium

Acid-Base Equilibria

Additional Aspects of Equilibria

Chemistry of the Environment

Electrochemistry

Nuclear Chemistry

Chemistry of the Nonmetals

Metals and Metallurgy

Chemistry of Coordination Compounds

The Chemistry of Life: Organic and Biological Chemistry

Filters

Use the table below to answer the questions that follow. Thermodynamic Quantities for Selected Substances at 298.15 K (25°C) -The combustion of ethane in the presence of excess oxygen yields carbon dioxide and water: The value of OS^ofor this reaction is J/K.

The standard Gibbs free energy of formation of is zero. (a) H₂O (l) (b) O (g) (c) H₂ (g)

Use the table below to answer the questions that follow. Thermodynamic Quantities for Selected Substances at 298.15 K (25°C) -The value of ΔG° at 25 °C for the formation of POCl₃from its constituent elements, is kJ/mol.

Use the table below to answer the questions that follow. Thermodynamic Quantities for Selected Substances at 298.15 K (25°C) -The value of ΔS° for the decomposition of POCl₃into its constituent elements, is J/K.

Calculate OG^○for the autoionization of water at 25^○C. K_w= 1.0 × 10^-¹⁴

Use the table below to answer the questions that follow. Thermodynamic Quantities for Selected Substances at 298.15 K (25°C) -Consider the reaction: Given the following table of thermodynamic data at 298 ^oK: The value K for the reaction at 25 °C is .