A piston-cylinder apparatus contains 20 ft° of nitrogen (assume ideal gas). The piston is expanded isothermally from an initial state of 20 psia and 40°F to some final state. During the process, the...

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Extracted text: A piston-cylinder apparatus contains 20 ft° of nitrogen (assume ideal gas). The piston is expanded isothermally from an initial state of 20 psia and 40°F to some final state. During the process, the heat transfer is carefully measured, and a heat addition to the gas equal to 100 Btu is required to keep the gas temperature constant. For this process, calculate: (a) the work (Btu) done by the gas during the process (b) the final pressure (psia) of the gas