A piston -cylinder device with a set of stops contains 10 kg of refrigerant -134a. Initially, 8 kg of the refrigerant is in the liquid form, and ttemperature is - 8⁰c. Now heat is transferred slowly to the refrigerant until the piston hits the stops, at which point the volume is 400 L . Determine (a) the temperature when the piston first hits the stops (b) the work done during this process. Show the process on T-v and P-v diagrams.