physics

A piston–cylinder device contains 0.85 kg of refrigerant-134a at -10°C. The piston that is free to move has a mass of 60 kg and a diameter of 25 cm. The local atmospheric pressure is 88 kPa. Now, heat is transferred to refrigerant-134a until the temperature is 20°C. a) Determine the final pressure b) Determine the change in the volume of the cylinder c) Determine the change in the internal energy of the refrigerant-134a. d) Draw the T-v and P-v diagrams of the process