A piston-cylinder device contains 0.85 kg of refrigerant- 134a at 210oC. The piston that is free to

Question:

A piston-cylinder device contains 0.85 kg of refrigerant- 134a at 210oC. The piston that is free to move has a mass of 12 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 15oC. Determine
(a) The final pressure,
(b) The change in the volume of the cylinder, and (c) the change in the enthalpy of the refrigerant-134a.