APFIVE Entropy Change in Isothermal Expansion
A gas expands isothermally against a piston. Which of the following best describes the entropy change of the universe during this process?
A
Is zero because isothermal processes are reversible
B
Remains constant because the temperature is unchanged
C
Increases because the overall process is irreversible due to free expansion
D
Decreases because the gas is doing work on the surroundings
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