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A heat engine consists of 0.85 moles of diatomic gas following three steps. Expansion from 0.03...

A heat engine consists of 0.85 moles of diatomic gas following three steps. Expansion from 0.03 m^3 to 0.1 m^3 at a constant pressure of 0.7 atm. Then, the pressure is reduced at constant volume. Finally, it returns to the original point by following an isothermal path in a PV diagram. What is the change in entropy of the gas for one cycle? What is the change in entropy of the universe if the hot reservoir is 1200 K and the cold reservoir is at 273 K?

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