A piston-cylinder assembly contains 0.5 kg of ammonia. Initially, the quality is 25% and the temperature is -20 °C. The ammonia is slowly heated to a final state, where the temperature is 20°C and the pressure is 600 kPa. Assume that the pressure of the ammonia varies linearly with specific volume. There are no significant kinetic and potential energy effects. (a) Show the process on a sketch of the P-v diagram (b) Evaluate the work and heat transfer (in kJ).