Question: An engine using 1 mol of an ideal gas initially at V 1 = 24.6 L and T = 400 K performs a cycle consisting

An engine using 1 mol of an ideal gas initially at V₁ = 24.6 L and T = 400 K performs a cycle consisting of four steps: (1) an isothermal expansion at T = 400 K to twice its initial volume, (2) cooling at constant volume to T = 300 K, (3) an isothermal compression to its original volume, and (4) heating at constant volume to its original temperature of 400 K. Assume that C_v= 21 J/K. Sketch the cycle on a PV diagram and find its efficiency.

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