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A piston-cylinder assembly contains 0.3 lb of propane. The propane expands from an initial state where p₁ = 60 lbf/in.² and T₁ = 90°F
to a final state where p2 = 10 lbf/in.² During the process, the pressure and specific volume are related by pv² = constant.
Determine the energy transfer by work, in Btu.
W=
Mi
Btu

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