A system consisting of 3 lb of water vapor in a piston– cylinder assembly, initially at 350°F and a volume of 71.7 ft3, is expanded in a constant-pressure process to a volume of]

85.38 ft3. The system then is compressed isothermally to a final volume of 28.2 ft3. During the isothermal compression, energy transfer by work into the system is 72 Btu. Kinetic and potential energy effects are negligible. Determine the   heat

Sketch the two processes in series on a p–y diagram. Neglecting kinetic and potential energy effects, evaluate for each process the work and heat transfer, each in  kJ.

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