A piston-cylinder device contains 0.85 kg of refrigerant-134a at –10°C. The piston that is free tomove 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 15°C. 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.