One Mole of a Monatomic Ideal Gas at a Pressure

question 2

Multiple Choice

One mole of a monatomic ideal gas at a pressure of 3.0 atm and a volume of 30 L is isothermally expanded to a pressure of 1.0 atm and a volume of 90 L.Afterwards it is compressed at a constant pressure until its volume is 30 L and then it's pressure is increased at a constant volume back to the original volume of 30 L as shown in the PV diagram.What is the efficiency of this heat engine cycle?

• A)0.21
• B)0.43
• C)0.57
• D)0.67
• E)0.91

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