Ammonia in a pistoncylinder assembly undergoes two

Chapter 3, Problem 3.74

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Ammonia in a piston–cylinder assembly undergoes two processes in series. Initially, the ammonia is saturated vapor at \(p_{1}=100 \mathrm{lbf} / \mathrm{in} .^{2}\) Process 1–2 involves cooling at constant pressure until \(x_{2}=75 \%\). The second process, from state 2 to state 3, involves heating at constant volume until \(x_{3}=100 \%\). Kinetic and potential energy effects are negligible. For 1.2 lb of ammonia, determine (a) the heat transfer and work for Process 1–2 and (b) the heat transfer for Process 2–3, all in Btu.

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