Which of the following describes a process in which the entropy of the system would decrease?
A. A saturated vapor is isothermally and isobarically condensed.
B. Liquid water is evaporated by isothermal expansion (pulling a vacuum on it).
C. The system is the fluid inside a compressor that operates at steady state.
D. A subcooled liquid is distilled at constant pressure into saturated vapor and liquid.
E. None of the above
A. Correct. Any substance will have a lower entropy when it is in the liquid phase compared to the gas phase at the same T and P.
B. Incorrect. At a constant temperature, steam will have a higher entropy than liquid water.
C. Incorrect. At steady state, the entropy of the system is constant.
D. Incorrect. The increase in temperature of the feed from subcooled to saturated increases entropy, as does the phase change.
E. Incorrect. One of these systems does decreases in entropy.
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