R-12 in a piston-cylinder arrangement is initially at 50°C, x = 1. It is then expanded in a process so that P = Cv^(−1) to a pressure of 100 kPa. Find the work.

• A. 23.2 kJ/kg
• B. 33.2 kJ/kg
• C. 43.2 kJ/kg
• D. 53.2 kJ/kg