A frictionless piston maintains a co.1nstant pressure of 150 kPa on the steam in a vertical cylinder. The temperature is reduced from 200ºC until it reaches 60ºC. The work done by the piston on the steam is nearest:
A) 161 kJ/kg
B) 188 kJ/kg
C) 212 kJ/kg
D) 244 kJ/kg
D) 244 kJ/kg
The work (specific work since the mass isn’t given) of the piston on the steam is
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