Question 1

Which of the following is always true for an endothermic process?

Accepted Answer

A)  q sys > 0, Δ\DeltaΔ Ssurr 
B)  qsys Δ\DeltaΔ Ssurr > 0
C)  qsys Δ\DeltaΔ Ssurr 
D)  qsys > 0, Δ\DeltaΔ Ssurr > 0
E)  w < 0 F) A) and E)
G) A) and D)

Question 2

Use the thermodynamic data at 298 K below to determine the Ksp for barium carbonate,BaCO3 at this temperature.
sp for barium carbonate,BaCO3 at this temperature.   A) 5.86 B) 6.30  	imes  108 C) 1.59  	imes  10-9 D) 5.47  	imes  10-21 E) 2.18  	imes  10-27 " class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  5.86
B)  6.30  ×	imes×  108
C)  1.59  ×	imes×  10-9
D)  5.47  ×	imes×  10-21
E)  2.18  ×	imes×  10-27 F) A) and B)
G) A) and C)

Question 3

Calculate  Δ\DeltaΔ S° for the combustion of propane.
C3H8(g) + 5O2(g)   →	o→ 3CO2(g) + 4H2O(g) 
3H8(g) + 5O2(g)   	o 3CO2(g) + 4H2O(g)    A) -100.9 J/K B) -72.5 J/K C) 72.5 J/K D) 100.9 J/K E) 877.5 J/K " class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  -100.9 J/K
B)  -72.5 J/K
C)  72.5 J/K
D)  100.9 J/K
E)  877.5 J/K F) B) and D)
G) A) and E)

Question 4

Calculate  Δ\DeltaΔ G° for the reaction of ammonia with fluorine.
2NH3(g) + 5F2(g)   →	o→  N2F4(g) + 6HF(g) 
3(g) + 5F2(g)   	o  N2F4(g) + 6HF(g)    A) 179.1 kJ B) -179.1 kJ C) 1539.7 kJ D) -1539.7 kJ E) None of these choices is correct. " class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  179.1 kJ
B)  -179.1 kJ
C)  1539.7 kJ
D)  -1539.7 kJ
E)  None of these choices is correct. F) C) and D)
G) B) and E)

Exam 20: Thermodynamics: Entropy, free Energy, and the Direction of Chemical Reactions

Correct Answer
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Which of the following is always true for an endothermic process?

Correct Answer
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Correct Answer
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Correct Answer
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Exam 20: Thermodynamics: Entropy, free Energy, and the Direction of Chemical Reactions

Use the thermodynamic data at 298 K below to determine the Ksp for barium carbonate,BaCO3 at this temperature.

Correct AnswerverifiedShow Answer

Which of the following is always true for an endothermic process?

Correct AnswerverifiedShow Answer

Calculate Δ\DeltaΔ S° for the combustion of propane. C3H8(g) + 5O2(g) →\to→ 3CO2(g) + 4H2O(g)

Correct AnswerverifiedShow Answer

Calculate Δ\DeltaΔ G° for the reaction of ammonia with fluorine. 2NH3(g) + 5F2(g) →\to→ N2F4(g) + 6HF(g)

Correct AnswerverifiedShow Answer

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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