7-171E A piston-cylinder device initially contains 15 ft3 of helium gas at 25 psia and 70°F. Helium is now compressed in a polytropic process (PVn = constant) to 70 psia and 300°F. Determine a) the entropy change of helium, b) the entropy change of the surroundings, and c) whether this process is reversible, irreversible, or impossible. Assume the surroundings are at 70°F. | |
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