Question 1

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 dioxide,  is J/K.

Accepted Answer

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

Question 2

For a reaction to be spontaneous under standard conditions at all temperatures, the signs of ΔH° and ΔS° must be _ _ and , respectively.

Accepted Answer

A)   +, +
B)   +, -
C)   - , +
D)   - , -
E)   +, 0 C

Question 3

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 formation of calcium chloride from its constituent elements,  is kJ/mol.

Accepted Answer

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

Question 4

Find the temperature above which a reaction with a OH of 123 .0 kJ/mol and a OS of 90.00 J/K·mol becomes spontaneous.

Accepted Answer

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

Question 5

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 formation of phosphorous trichloride from its constituent elements,  is J/K.

Accepted Answer

A)   +129.4
B)   +311.7
C)   - 263.7
D)   - 129.4
E)   - 311.7

Question 6

Of the following, the entropy of gaseous _ is the largest at 25 °C and 1 atm.

Accepted Answer

A)   C2H4 
B)   C2H2 
C)   C2H6 
D)   H2 
E)   CH4

Question 7

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 gaseous sulfur trioxide to its component elements,  is kJ/mol.

Accepted Answer

A)   +790.4
B)   +395.2
C)   +105.1
D)   - 395.2
E)   - 790.4

Question 8

Use the table below to answer the questions that follow.
 o for this reaction is J/K. A)  - 347.6 B)  +140.9 C)  - 140.9 D)  +347.6 E)  - 267.4" class="answers-bank-image d-inline" rel="preload" > Thermodynamic Quantities for Selected Substances at 298.15 K (25°C)  o for this reaction is J/K. A)  - 347.6 B)  +140.9 C)  - 140.9 D)  +347.6 E)  - 267.4" class="answers-bank-image d-inline" rel="preload" >
-The combustion of ethene in the presence of excess oxygen yields carbon dioxide and water:
o for this reaction is J/K. A)  - 347.6 B)  +140.9 C)  - 140.9 D)  +347.6 E)  - 267.4" class="answers-bank-image d-inline" rel="preload" >
The value of OSo for this reaction is J/K.

Accepted Answer

A)   - 347.6
B)   +140.9
C)   - 140.9
D)   +347.6
E)   - 267.4

Question 9

Use the table below to answer the questions that follow.
Thermodynamic Quantities for Selected Substances at 298.15 K (25°C)  3 from its constituent elements,   is J/K. A)  - 321 B)  - 771 C)  +321 D)  +771 E)  - 442" class="answers-bank-image d-inline" rel="preload" >
-The value of OS° for the formation of POCl3 from its constituent elements, 3 from its constituent elements,   is J/K. A)  - 321 B)  - 771 C)  +321 D)  +771 E)  - 442" class="answers-bank-image d-inline" rel="preload" > is J/K.

Accepted Answer

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

Question 10

For the reaction  ΔH° is +137 kJ/mol and ΔS° is +120 J/K · mol. This reaction is .

Accepted Answer

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

Question 11

A common name for methanol (CH3OH)  is wood alcohol. The normal boiling point of methanol is 64.7 °C and the molar enthalpy of vaporization if 71.8 kJ/mol. The value of ΔS when 2.15 mol of CH3OH (l)  vaporizes at 64.7 °C is J/K.

Accepted Answer

A)   5.21 × 107 
B)   0.457
C)   457
D)   2.39
E)   2.39 × 103

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 ΔS° for the catalytic hydrogenation of acetylene 
Is J/K.

Accepted Answer

A)   +550.8
B)   +18.6
C)   - 18.6
D)   +112.0
E)   - 112.0

Question 13

A reaction that is spontaneous as written .

Accepted Answer

A)   is very rapid
B)   is very slow
C)   will proceed without outside intervention
D)   is also spontaneous in the reverse direction
E)   has an equilibrium position that lies far to the left

Question 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 ΔS° for the oxidation of carbon to carbon 
Is J/K. The combustion of carbon, as in charcoal briquettes, in the presence of abundant oxygen produces carbon dioxide.

Accepted Answer

A)   +2.9
B)   - 2.9
C)   - 205.0
D)   +205.0
E)   +424.3

Question 15

Of the following, the entropy of is the largest.

Accepted Answer

A)   HCl (g) 
B)   HCl (s) 
C)   HCl (l) 
D)   HBr (g) 
E)   HI (g)

Question 16

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 formation of calcium chloride from its constituent elements,  is J/K.

Accepted Answer

A)   +104.6
B)   - 104.6
C)   +159.8
D)   - 159.8
E)   +369.0

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 ΔG° at 25 °C for the decomposition of calcium chloride into its constituent elements,  is kJ/mol.

Accepted Answer

A)   - 748.1
B)   +748.1
C)   +763.7
D)   - 795.8
E)   +795.8 B

Question 18

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 calcium chloride from its constituent elements,  is kJ/mol.

Accepted Answer

A)   - 795.8
B)   +748.1
C)   +795.8
D)   +763.7
E)   - 748.1 E

Question 19

Use the table below to answer the questions that follow.
Thermodynamic Quantities for Selected Substances at 298.15 K (25°C)  2 (g)  - 2CO (g)  is J/K. A)  +9.5 B)  - 195.7 C)  - 9.5 D)  - 185.9 E)  +185.9" class="answers-bank-image d-inline" rel="preload" >
-The value of ΔS° for the reaction
2C (s, diamond)  + O2 (g)  - 2CO (g)  is J/K.

Accepted Answer

A)   +9.5
B)   - 195.7
C)   - 9.5
D)   - 185.9
E)   +185.9

Question 20

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

Accepted Answer

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

Exam 19: Chemical Thermodynamics

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 dioxide, is J/K.

Correct Answer
verified

For a reaction to be spontaneous under standard conditions at all temperatures, the signs of ΔH° and ΔS° must be _ _ and , respectively.

Correct Answer
verified
C

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 formation of calcium chloride from its constituent elements, is kJ/mol.

Correct Answer
verified

Find the temperature above which a reaction with a OH of 123 .0 kJ/mol and a OS of 90.00 J/K·mol becomes spontaneous.

Correct Answer
verified

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 formation of phosphorous trichloride from its constituent elements, is J/K.

Correct Answer
verified

Of the following, the entropy of gaseous _ is the largest at 25 °C and 1 atm.

Correct Answer
verified

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 gaseous sulfur trioxide to its component elements, is kJ/mol.

Correct Answer
verified

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

Correct Answer
verified

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

Correct Answer
verified

For the reaction ΔH° is +137 kJ/mol and ΔS° is +120 J/K · mol. This reaction is .

Correct Answer
verified

A common name for methanol (CH₃OH) is wood alcohol. The normal boiling point of methanol is 64.7 °C and the molar enthalpy of vaporization if 71.8 kJ/mol. The value of ΔS when 2.15 mol of CH₃OH (l) vaporizes at 64.7 °C is J/K.

Correct Answer
verified

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 catalytic hydrogenation of acetylene Is J/K.

Correct Answer
verified

A reaction that is spontaneous as written .

Correct Answer
verified

Correct Answer
verified

Of the following, the entropy of is the largest.

Correct Answer
verified

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 formation of calcium chloride from its constituent elements, is J/K.

Correct Answer
verified

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 calcium chloride into its constituent elements, is kJ/mol.

Correct Answer
verified
B

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 calcium chloride from its constituent elements, is kJ/mol.

Correct Answer
verified
E

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 reaction 2C (s, diamond) + O₂(g) - 2CO (g) is J/K.

Correct Answer
verified

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

Correct Answer
verified

Exam 19: Chemical Thermodynamics

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 dioxide, is J/K.

Correct AnswerverifiedShow Answer

For a reaction to be spontaneous under standard conditions at all temperatures, the signs of ΔH° and ΔS° must be _ _ and , respectively.

Correct AnswerverifiedC

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 formation of calcium chloride from its constituent elements, is kJ/mol.

Correct AnswerverifiedShow Answer

Find the temperature above which a reaction with a OH of 123 .0 kJ/mol and a OS of 90.00 J/K·mol becomes spontaneous.

Correct AnswerverifiedShow Answer

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 formation of phosphorous trichloride from its constituent elements, is J/K.

Correct AnswerverifiedShow Answer

Of the following, the entropy of gaseous _ is the largest at 25 °C and 1 atm.

Correct AnswerverifiedShow Answer

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 gaseous sulfur trioxide to its component elements, is kJ/mol.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

For the reaction ΔH° is +137 kJ/mol and ΔS° is +120 J/K · mol. This reaction is .

Correct AnswerverifiedShow Answer

A common name for methanol (CH3OH) is wood alcohol. The normal boiling point of methanol is 64.7 °C and the molar enthalpy of vaporization if 71.8 kJ/mol. The value of ΔS when 2.15 mol of CH3OH (l) vaporizes at 64.7 °C is J/K.

Correct AnswerverifiedShow Answer

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 catalytic hydrogenation of acetylene Is J/K.

Correct AnswerverifiedShow Answer

A reaction that is spontaneous as written .

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Of the following, the entropy of is the largest.

Correct AnswerverifiedShow Answer

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 formation of calcium chloride from its constituent elements, is J/K.

Correct AnswerverifiedShow Answer

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 calcium chloride into its constituent elements, is kJ/mol.

Correct AnswerverifiedB

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 calcium chloride from its constituent elements, is kJ/mol.

Correct AnswerverifiedE

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 reaction 2C (s, diamond) + O2 (g) - 2CO (g) is J/K.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Correct Answer
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Correct Answer
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C

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
verified

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

Correct Answer
verified

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

Correct Answer
verified

Correct Answer
verified

A common name for methanol (CH₃OH) is wood alcohol. The normal boiling point of methanol is 64.7 °C and the molar enthalpy of vaporization if 71.8 kJ/mol. The value of ΔS when 2.15 mol of CH₃OH (l) vaporizes at 64.7 °C is J/K.

Correct Answer
verified

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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B

Correct Answer
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E

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 reaction 2C (s, diamond) + O₂(g) - 2CO (g) is J/K.

Correct Answer
verified

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

Correct Answer
verified