kg of R134a is contained within a frictionless piston-cylinder device at a pressure of 1.6 MPa and at a temperature of 120C. Heat is now transferred to the device. This causes it to xpand at constant pressure until the temperature reaches 175C. (a) (1 mark) Sketch the process on a graph of pressure vs specific volume (Pv). Be sure to label the start and end points of the process. (b) (3 marks) Show that the R-134a cannot be treated as an ideal gas (to 5% accuracy), using the compressibility chart. (c) (3 marks) Calculate the total work done by the system (in kJ) during the expansion. (d) (3 marks) Determine the heat transferred into the device during this process (in kJ)