A Piston-Cylinder Device Contains 3 Kg of Air at 300

Multiple Choice

A piston-cylinder device contains 3 kg of air at 300 kPa and 25°C. During a quasi-equilibrium isothermal expansion process, 20 kJ of boundary work is done by the system, and 8 kJ of paddle-wheel work is done on the system. The heat transfer during this process is

A) 28 kJ
B) 20 kJ
C) 36 kJ
D) 12 kJ
E) 4 kJ