Question 1

Calculate ΔG°rxn for the following reaction of ammonia with fluorine. 2NH3(g)  + 5F2(g)  → N2F4(g)  + 6HF(g)  rxn for the following reaction of ammonia with fluorine. 2NH3(g)  + 5F2(g)  → N2F4(g)  + 6HF(g)    A)  179.1 kJ/mol B)  -179.1 kJ/mol C)  1539.7 kJ/mol D)  -1539.7 kJ/mol E)  -211.9 kJ/mol" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   179.1 kJ/mol
B)   -179.1 kJ/mol
C)   1539.7 kJ/mol
D)   -1539.7 kJ/mol
E)   -211.9 kJ/molF) C) and D)
G) A) and D)

Question 2

Which is necessary for a process to be spontaneous?

Accepted Answer

A)   ΔHsys 
B)   ΔSsys > 0
C)   ΔSsurr 
D)   ΔSuniv > 0
E)   ΔGsys = 0F) C) and E)
G) None of the above

Question 3

The temperature at which the following process reaches equilibrium at 1.0 atm is the normal boiling point of hydrogen peroxide. (R = 8.314 J/K • mol)  H2O2(l)  2O2(l)    H2O2(g)  Use the following thermodynamic information at 298 K to estimate this temperature.   A)  120°C B)  144°C C)  196°C D)  418°C E)  585°C" class="answers-bank-image d-inline" rel="preload" > H2O2(g) 
Use the following thermodynamic information at 298 K to estimate this temperature. 2O2(l)    H2O2(g)  Use the following thermodynamic information at 298 K to estimate this temperature.   A)  120°C B)  144°C C)  196°C D)  418°C E)  585°C" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   120°C
B)   144°C
C)   196°C
D)   418°C
E)   585°CF) A) and E)
G) A) and B)

Question 4

ΔSuniv = -1 for a spontaneous reaction.

Accepted Answer

A) True 
 B)False

Question 5

When a sky diver free-falls through the air, the process is

Accepted Answer

A)   nonspontaneous because he is accelerating due to the force applied by gravity.
B)   nonspontaneous because he is losing potential energy.
C)   nonspontaneous because he had planned the jump for two weeks.
D)   spontaneous.
E)   in equilibrium.F) B) and E)
G) All of the above

Question 6

Which is always true for an exothermic process?

Accepted Answer

A)   qsys > 0, ΔSsurr 
B)   qsys surr > 0
C)   qsys surr 
D)   qsys > 0, ΔSsurr > 0
E)   w < 0F) B) and E)
G) B) and D)

Question 7

Which response includes all of the following processes that are accompanied by an increase in entropy? 1. I2(s)  → I2(g) 
2)  2I(g)  → I2(g) 
3)  2NH3(g)  → N2(g)  + 3H2(g) 
4)  Mg2+(aq)  + 2OH-(aq)  → Mg(OH) 2(s)

Accepted Answer

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

Exam 18: Entropy, Free Energy, and Equilibrium

Which response includes all of the following processes that are accompanied by an increase in entropy? 1. I₂(s) → I₂(g) 2) 2I(g) → I₂(g) 3) 2NH₃(g) → N₂(g) + 3H₂(g) 4) Mg²⁺(aq) + 2OH^-(aq) → Mg(OH) ₂(s)

Correct Answer
verified

ΔS_univ = -1 for a spontaneous reaction.

Correct Answer
verified

The temperature at which the following process reaches equilibrium at 1.0 atm is the normal boiling point of hydrogen peroxide. (R = 8.314 J/K • mol) H₂O₂(l) H₂O₂(g) Use the following thermodynamic information at 298 K to estimate this temperature.

Correct Answer
verified

Which is necessary for a process to be spontaneous?

Correct Answer
verified

When a sky diver free-falls through the air, the process is

Correct Answer
verified

Calculate ΔG°_rxn for the following reaction of ammonia with fluorine. 2NH₃(g) + 5F₂(g) → N₂F₄(g) + 6HF(g)

Correct Answer
verified

Which is always true for an exothermic process?

Correct Answer
verified

Exam 18: Entropy, Free Energy, and Equilibrium

Which response includes all of the following processes that are accompanied by an increase in entropy? 1. I2(s) → I2(g) 2) 2I(g) → I2(g) 3) 2NH3(g) → N2(g) + 3H2(g) 4) Mg2+(aq) + 2OH-(aq) → Mg(OH) 2(s)

Correct AnswerverifiedShow Answer

ΔSuniv = -1 for a spontaneous reaction.

Correct AnswerverifiedShow Answer

The temperature at which the following process reaches equilibrium at 1.0 atm is the normal boiling point of hydrogen peroxide. (R = 8.314 J/K • mol) H2O2(l) H2O2(g) Use the following thermodynamic information at 298 K to estimate this temperature.

Correct AnswerverifiedShow Answer

Which is necessary for a process to be spontaneous?

Correct AnswerverifiedShow Answer

When a sky diver free-falls through the air, the process is

Correct AnswerverifiedShow Answer

Calculate ΔG°rxn for the following reaction of ammonia with fluorine. 2NH3(g) + 5F2(g) → N2F4(g) + 6HF(g)

Correct AnswerverifiedShow Answer

Which is always true for an exothermic process?

Correct AnswerverifiedShow Answer

Which response includes all of the following processes that are accompanied by an increase in entropy? 1. I₂(s) → I₂(g) 2) 2I(g) → I₂(g) 3) 2NH₃(g) → N₂(g) + 3H₂(g) 4) Mg²⁺(aq) + 2OH^-(aq) → Mg(OH) ₂(s)

Correct Answer
verified

ΔS_univ = -1 for a spontaneous reaction.

Correct Answer
verified

The temperature at which the following process reaches equilibrium at 1.0 atm is the normal boiling point of hydrogen peroxide. (R = 8.314 J/K • mol) H₂O₂(l) H₂O₂(g) Use the following thermodynamic information at 298 K to estimate this temperature.

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Calculate ΔG°_rxn for the following reaction of ammonia with fluorine. 2NH₃(g) + 5F₂(g) → N₂F₄(g) + 6HF(g)

Correct Answer
verified

Correct Answer
verified