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Oxygen gas is compressed in a piston-cylinder device from an initial state of 0.8 m/kg and 25C to a final state of 0.1 m/kg

Oxygen gas is compressed in a piston-cylinder device from an initial state of 0.8 m/kg and 25C to a final state of 0.1 m/kg and 287C. Determine the entropy change of the oxygen during this process. Assume constant specific heats.

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