Two kilograms of air, at an initial temperature of 24ºC, expand in a cylinder with a polytropic process such that Pv1.2 = const. The pressure changes 800 kPa to 100 kPa. The heat transfer, assuming a quasi-equilibrium process, is nearest:

A) 125 kJ
B) 150 kJ
C) 175 kJ
D) 200 kJ


B) 150 kJ



This requires v1 and v2 which are



The first law is then used to find the heat transfer:

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