A frictionless piston cylinder device contains 5 kg of steam at 400 kPa and 200°C. The heat is now transferred to the steam until the temperature reaches 250°C. If the piston is not attached to a shaft, its mass is constant, and by taking the values of specific volume v1 as 0.53434 m3/kg and v2 as 0.59520 m3/kg, the work done by the steam during this process is

A frictionless piston cylinder device contains 5 kg of steam at 400 kP

1.	A frictionless piston cylinder device contains 5 kg of steam at 400 kPa and 200°C. The heat is now transferred to the steam until the temperature reaches 250°C. If the piston is not attached to a shaft, its mass is constant, and by taking the values of specific volume v1 as 0.53434 m3/kg and v2 as 0.59520 m3/kg, the work done by the steam during this process is
A.	121.7 kJ
B.	137.5 kJ
C.	153.3 kJ
D.	189.1 kJ
Answer» B. 137.5 kJ

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