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An amount of nitrogen gas is used as the system of a heat engine. There are...

An amount of nitrogen gas is used as the system of a heat engine. There are four processes in the cycle. 1. Starting at 20 atm and 2 liters, the gas expands isothermally to 10 liters and 800K. 2. The gas then cools isochorically to 400K. 3. Then the gas is compressed isothermally to 2 liters again. 4. Finally, the gas is heated isochorically again to 800K and its starting point. What is the efficiency of the engine (in per cent)?

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