Question 1

The reaction of methane with water to form carbon dioxide and hydrogen is nonspontaneous at 98 K. At what temperature will this system make the transition from nonspontaneous to spontaneous? The following data are valid at 298 K: CH4(g)  + 2H2O(g)  4(g)  + 2H2O(g)    CO2(g)  + 4H2(g)    A)  658 K B)  683 K C)  955 K D)  1047 K E)  1229 K" class="answers-bank-image d-inline" rel="preload" > CO2(g)  + 4H2(g)  4(g)  + 2H2O(g)    CO2(g)  + 4H2(g)    A)  658 K B)  683 K C)  955 K D)  1047 K E)  1229 K" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   658 K
B)   683 K
C)   955 K
D)   1047 K
E)   1229 KF) A) and E)
G) All of the above

Question 2

Elemental boron can be formed by the reaction of boron trichloride with hydrogen. 2BCl3(g)  + 3H2(g)  → 2B(s)  + 6HCl(g) 
What is ΔG°rxn for this reaction? 3(g)  + 3H2(g)  → 2B(s)  + 6HCl(g)  What is ΔG°rxn for this reaction?   A)  -293.4 kJ/mol B)  293.4 kJ/mol C)  -205.6 kJ/mol D)  205.6 kJ/mol E)  -2141.6 kJ/mol" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   -293.4 kJ/mol
B)   293.4 kJ/mol
C)   -205.6 kJ/mol
D)   205.6 kJ/mol
E)   -2141.6 kJ/molF) D) and E)
G) A) and E)

Question 3

What is ΔS° for the reaction SO2(s)  + NO2(g)  → SO3(g)  + NO(g) ? 2(s)  + NO2(g)  → SO3(g)  + NO(g) ?   A)  53.6 J/K • mol B)  -53.6 J/K • mol C)  -22.2 J/K • mol D)  474.8 J/K • mol E)  -474.8 J/K • mol" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   53.6 J/K • mol
B)   -53.6 J/K • mol
C)   -22.2 J/K • mol
D)   474.8 J/K • mol
E)   -474.8 J/K • molF) A) and B)
G) C) and D)

Question 4

What is ΔG°rxn for the following reaction? SiCl4(g)  + 2Mg(s)  → 2MgCl2(s)  + Si(s)  rxn for the following reaction? SiCl4(g)  + 2Mg(s)  → 2MgCl2(s)  + Si(s)    A)  566.60 kJ/mol B)  50.38 kJ/mol C)  25.19 kJ/mol D)  -25.19 kJ/mol E)  -566.60 kJ/mol" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   566.60 kJ/mol
B)   50.38 kJ/mol
C)   25.19 kJ/mol
D)   -25.19 kJ/mol
E)   -566.60 kJ/molF) A) and E)
G) A) and C)

Question 5

In a spontaneous process, the entropy of the system always increases.

Accepted Answer

A) True 
 B)False

Question 6

The temperature at which the following process reaches equilibrium at 1.0 atm is the normal melting point for phosphoric acid. H3PO4(s)  3PO4(s)    H3PO4(l)  Use the following thermodynamic data at 298 K to estimate this temperature.   A)  286 K B)  305 K C)  315 K D)  347 K E)  3170 K" class="answers-bank-image d-inline" rel="preload" > H3PO4(l) 
Use the following thermodynamic data at 298 K to estimate this temperature. 3PO4(s)    H3PO4(l)  Use the following thermodynamic data at 298 K to estimate this temperature.   A)  286 K B)  305 K C)  315 K D)  347 K E)  3170 K" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   286 K
B)   305 K
C)   315 K
D)   347 K
E)   3170 KF) A) and B)
G) All of the above C

Question 7

Elemental boron can be formed by the reaction of boron trichloride with hydrogen. 2BCl3(g)  + 3H2(g)  → 2B(s)  + 6HCl(g)  3(g)  + 3H2(g)  → 2B(s)  + 6HCl(g)      A)  -18.2 J/K • mol B)  18.2 J/K • mol C)  289.5 J/K • mol D)  370.4 J/K • mol E)  579.0 J/K • mol" class="answers-bank-image d-inline" rel="preload" > 3(g)  + 3H2(g)  → 2B(s)  + 6HCl(g)      A)  -18.2 J/K • mol B)  18.2 J/K • mol C)  289.5 J/K • mol D)  370.4 J/K • mol E)  579.0 J/K • mol" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   -18.2 J/K • mol
B)   18.2 J/K • mol
C)   289.5 J/K • mol
D)   370.4 J/K • mol
E)   579.0 J/K • molF) A) and D)
G) A) and C)

Question 8

How many types of vibrations does a diatomic molecule exhibit?

Accepted Answer

A)   0
B)   1
C)   2
D)   3
E)   4F) B) and D)
G) A) and C)

Question 9

What is ΔS° for the reaction SO3(g)  + H2O(l)  → H2SO4(aq) ? 3(g)  + H2O(l)  → H2SO4(aq) ?   A)  169.2 J/K • mol B)  343.2 J/K • mol C)  -169.2 J/K • mol D)  -29.4 J/K • mol E)  29.4 J/K • mol" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   169.2 J/K • mol
B)   343.2 J/K • mol
C)   -169.2 J/K • mol
D)   -29.4 J/K • mol
E)   29.4 J/K • molF) B) and E)
G) A) and B)

Question 10

Is the following process spontaneous?  0. B)  No, because ΔH  0. D)  No, because ΔS

Accepted Answer

A)   Yes, because ΔH > 0.
B)   No, because ΔH 
C)   Yes, because ΔS > 0.
D)   No, because ΔS 
E)   It's impossible to tell without knowing the temperature of the system.F) A) and C)
G) A) and B) E

Question 11

Consider the figure below which shows ΔG° for a chemical process plotted against absolute temperature. From this plot, it is reasonable to conclude that:  0, ΔS° > 0 B)  ΔH° > 0, ΔS°  0 D)  ΔH°

Accepted Answer

A)   ΔH° > 0, ΔS° > 0
B)   ΔH° > 0, ΔS° 
C)   ΔH°  0
D)   ΔH° 
E)   None of these choices is correct.F) B) and C)
G) A) and B)

Question 12

Consider the figure below which shows ΔG° for a chemical process plotted against absolute temperature. From this plot, it is reasonable to conclude that:  0, ΔS° > 0 B)  ΔH° > 0, ΔS°  0 D)  ΔH°

Accepted Answer

A)   ΔH° > 0, ΔS° > 0
B)   ΔH° > 0, ΔS° 
C)   ΔH°  0
D)   ΔH° 
E)   None of these choices is correct.F) C) and D)
G) B) and D)

Question 13

Which statement is correct?

Accepted Answer

A)   Reaction of ADP and alanine results in ATP in the body.
B)   A positive ΔG° value means that the reaction is not product favored.
C)   CO2 is released when ADP reacts with an amino acid.
D)   Phosphoric acid is one of the products of the reaction of ADP with alanine.
E)   Hydrolysis of ATP requires NaOH.F) B) and E)
G) B) and D)

Question 14

Which thermodynamic property is a measure of the disorder in the system?

Accepted Answer

The answer of Which thermodynamic property is a measure of...

Question 15

What is defined as a process that may occur under a specific set of conditions?

Accepted Answer

A)   Conditional process
B)   Nonspontaneous process
C)   Specified process
D)   Spontaneous process
E)   Conditionality lawF) A) and D)
G) A) and E) D

Question 16

What is ΔS° at 25°C for the reduction of lead(II)  oxide by charcoal? 2PbO(s)  + C(s)  → 2Pb(s)  + CO2(g)  2(g)    A)  +198.7 J/K • mol B)  +488.0 J/K • mol C)  +353.7J/K • mol D)  -203.3 J/K • mol E)  +203.3 J/K • mol" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   +198.7 J/K • mol
B)   +488.0 J/K • mol
C)   +353.7J/K • mol
D)   -203.3 J/K • mol
E)   +203.3 J/K • molF) A) and E)
G) None of the above

Question 17

How does the entropy change when a solid is melted?

Accepted Answer

The answer of How does the entropy change when a...

Question 18

If an endothermic process is spontaneous when |TΔS| >|ΔH|, then is ΔS is positive, negative, or equal to zero?

Accepted Answer

The answer of If an endothermic process is spontaneous when...

Question 19

The ________ law of thermodynamics states that the entropy of the universe in a spontaneous process increases and is constant in equilibrium processes.

Accepted Answer

The answer of The ________ law of thermodynamics states that...

Question 20

The entropy of vaporization of a compound is always positive.

Accepted Answer

A) True 
 B)False

Exam 18: Entropy, Free Energy, and Equilibrium

The reaction of methane with water to form carbon dioxide and hydrogen is nonspontaneous at 98 K. At what temperature will this system make the transition from nonspontaneous to spontaneous? The following data are valid at 298 K: CH4(g) + 2H2O(g) CO2(g) + 4H2(g)

Correct AnswerverifiedShow Answer

Elemental boron can be formed by the reaction of boron trichloride with hydrogen. 2BCl3(g) + 3H2(g) → 2B(s) + 6HCl(g) What is ΔG°rxn for this reaction?

Correct AnswerverifiedShow Answer

What is ΔS° for the reaction SO2(s) + NO2(g) → SO3(g) + NO(g) ?

Correct AnswerverifiedShow Answer

What is ΔG°rxn for the following reaction? SiCl4(g) + 2Mg(s) → 2MgCl2(s) + Si(s)

Correct AnswerverifiedShow Answer

In a spontaneous process, the entropy of the system always increases.

Correct AnswerverifiedShow Answer

The temperature at which the following process reaches equilibrium at 1.0 atm is the normal melting point for phosphoric acid. H3PO4(s) H3PO4(l) Use the following thermodynamic data at 298 K to estimate this temperature.

Correct AnswerverifiedC

Elemental boron can be formed by the reaction of boron trichloride with hydrogen. 2BCl3(g) + 3H2(g) → 2B(s) + 6HCl(g)

Correct AnswerverifiedShow Answer

How many types of vibrations does a diatomic molecule exhibit?

Correct AnswerverifiedShow Answer

What is ΔS° for the reaction SO3(g) + H2O(l) → H2SO4(aq) ?

Correct AnswerverifiedShow Answer

Is the following process spontaneous?

Correct AnswerverifiedE

Consider the figure below which shows ΔG° for a chemical process plotted against absolute temperature. From this plot, it is reasonable to conclude that:

Correct AnswerverifiedShow Answer

Consider the figure below which shows ΔG° for a chemical process plotted against absolute temperature. From this plot, it is reasonable to conclude that:

Correct AnswerverifiedShow Answer

Which statement is correct?

Correct AnswerverifiedShow Answer

Which thermodynamic property is a measure of the disorder in the system?

Correct AnswerverifiedShow Answer

What is defined as a process that may occur under a specific set of conditions?

Correct AnswerverifiedD

What is ΔS° at 25°C for the reduction of lead(II) oxide by charcoal? 2PbO(s) + C(s) → 2Pb(s) + CO2(g)

Correct AnswerverifiedShow Answer

How does the entropy change when a solid is melted?

Correct AnswerverifiedShow Answer

If an endothermic process is spontaneous when |TΔS| >|ΔH|, then is ΔS is positive, negative, or equal to zero?

Correct AnswerverifiedShow Answer

The ________ law of thermodynamics states that the entropy of the universe in a spontaneous process increases and is constant in equilibrium processes.

Correct AnswerverifiedShow Answer

The entropy of vaporization of a compound is always positive.

Correct AnswerverifiedShow Answer

The reaction of methane with water to form carbon dioxide and hydrogen is nonspontaneous at 98 K. At what temperature will this system make the transition from nonspontaneous to spontaneous? The following data are valid at 298 K: CH₄(g) + 2H₂O(g) CO₂(g) + 4H₂(g)

Correct Answer
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Elemental boron can be formed by the reaction of boron trichloride with hydrogen. 2BCl₃(g) + 3H₂(g) → 2B(s) + 6HCl(g) What is ΔG°_rxn for this reaction?

Correct Answer
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What is ΔS° for the reaction SO₂(s) + NO₂(g) → SO₃(g) + NO(g) ?

Correct Answer
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What is ΔG°_rxn for the following reaction? SiCl₄(g) + 2Mg(s) → 2MgCl₂(s) + Si(s)

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The temperature at which the following process reaches equilibrium at 1.0 atm is the normal melting point for phosphoric acid. H₃PO₄(s) H₃PO₄(l) Use the following thermodynamic data at 298 K to estimate this temperature.

Correct Answer
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C

Elemental boron can be formed by the reaction of boron trichloride with hydrogen. 2BCl₃(g) + 3H₂(g) → 2B(s) + 6HCl(g)

Correct Answer
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What is ΔS° for the reaction SO₃(g) + H₂O(l) → H₂SO₄(aq) ?

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E

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D

What is ΔS° at 25°C for the reduction of lead(II) oxide by charcoal? 2PbO(s) + C(s) → 2Pb(s) + CO₂(g)

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