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Thermochemistry, Spontaneity, Entropy & Free Energy Problems

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Problems from chapter 6: Thermochemistry & chapter 17: Spontaneity, Entropy & Free Energy Just the questions, no answers

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  • July 4, 2024
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202-NYB-05: Course Notes Problems



Chapter 6: Thermochemistry. (Zumdahl/Zumdahl, 10th Ed)



Problem 1: Calculate E for a system undergoing an endothermic process in
which 15.6 kJ of heat flows and where 1.4 kJ of work is done on the system.



Problem 2: Calculate the work associated with the expansion of a gas from 46 L
to 64 L at a constant external pressure of 15 atm.



Chapter 17: Spontaneity, Entropy, and Free Energy.



Problem 1: Predict the sign of the entropy change (S) for each of the following
processes.

a) Solid sugar is added to water to form a solution.

b) Iodine vapor condenses on a cold surface to form crystals.

c) Freezing point (liquid to solid).

d) Sublimation (solid to gas)



Problem 2: Calculate Ssurr for the following reactions at 25o C and 1 atm.

a) Sb2S3 (s) + 3 Fe (s)  2 Sb (s) + 3 FeS (s) H = -125 kJ

b) Sb4O6 (s) + 6 C (s)  4 Sb (s) + 6 CO (g) H = 778 kJ



Problem 3: Predict the sign of So for each of the following reactions.

a) CaCO3 (s)  CaO (s) + CO2 (g)

b) 2 SO2 (g) + O2 (g)  2 SO3 (g)

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