Question: Superheated R-134a at 0.5 MPa, 20?C is cooled in a piston-cylinder at constant temperature to a final two-phase state with quality of 50%. The refrigerant mass is 5 kg, and during the process 500 kJ of heat is removed. Find the necessary work.
Options
A : -67.9 kJ
B : -77.9 kJ
C : -87.9 kJ
D : -97.9 kJ
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