A piston-cylinder device contains 0.85 kg of refrigerant-134a at 70oC. 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. The system is cooled until the temperature is 10oC. Determine (a) the final pressure, (b) the change in the volume of the cylinder, (c) the change in the enthalpy of the refrigerant-134a in kJ, and (d) plot the process on the P-v and T-v diagrams.