1. An ideal gas is expanded at constant temperature. What are the signs (+, -, o

Question

1. An ideal gas is expanded at constant temperature. What are the signs (+, -, or 0) of DeltaH, DeltaS, and DeltaG for this system?

A) ?H = +, ?S = -, ?G = +

B) ?H = 0, ?S = +, ?G = -

C) ?H = 0, ?S = -, ?G = +

D) ?H = -, ?S = +, ?G = -

2. The figure below represents the nonspontaneous reaction O2(g) --> 2O(g). What are the signs (+ or -) of DeltaH, DeltaS, and DeltaG for this process?

A) ?H = +, ?S = +, ?G = +

B) ?H = +, ?S = +, ?G = -

C) ?H = -, ?S = -, ?G = +

D) ?H = -, ?S = -, ?G = -

3. ) For the process CaCO>

Explanation / Answer

1) B) ?H = 0, ?S = +, ?G = -

2)
A) ?H = +, ?S = +, ?G = +

3) DS (surr) = q/t = - 0.21*10^3/298 = -0.7 J/K

  
DStotal = -0.7- 4.5 = -4.9 J/K, spontaneous

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