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A piston-cylinder device contains 0.5m^3 of helium gas at 150 kPa and 20C. The helium is then compressed in a polytropic process (constant PV^n) up

A piston-cylinder device contains 0.5m^3 of helium gas at 150 kPa and 20C. The helium is then compressed in a polytropic process (constant PV^n) up to 400 kPa and 140 C. Determine the heat lost or gained during this process.

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