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8 moles of a triatomic gas are taken through a closed cycle ABC, where AC is...

8 moles of a triatomic gas are taken through a closed cycle ABC, where AC is isothermal, AB is isobaric, BC is adiabatic. At A, the pressure is 3 atm and the temperature is 325 K. The volume at B is 6 times that at A. What is the efficiency of the cycle?
PV diagram, table of state variables, tables of process, step by step calculation is needed.
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