A penny that is initially at room temperature (20 C) is dropped into a thermos o

Question

A penny that is initially at room temperature (20 C) is dropped into a thermos of coffee that is initally at 90 C. When the top f the thermos is screwed on, the penny-coffe system is closed. What happens to the systems entropy as it comes to equilibrium?

A The entropy of the penny-coffee system increases.
B The entropy of the penny-coffee system decreases.
C The entropy of the penny increases, the entropy of the coffee decreases while the entropy of the penny-coffee system remains unchanged.
D The entropy of the penny decreases, the entropy of the coffee increases while the entropy of the penny-coffee system remains unchanged.
E The entropies of both the penny and coffee increase.

Explanation / Answer

C The entropy of the penny increases, the entropy of the coffee decreases while the entropy of the penny-coffee system remains unchanged.

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