A piston-cylinder device initially contains 10 ft3 of argon gas at 25 psia and 70oF. Argon is

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A piston-cylinder device initially contains 10 ft3 of argon gas at 25 psia and 70oF. Argon is now compressed in a polytropic process (pVn = constant) to 70 psia and 300oF. Determine
(a) If the process is 1: reversible, 2: impossible or 3: irreversible.
(b) Also determine the change of entropy for argon.
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