A 10-kg mass of superheated refrigerant-134a at 1.2 MPa and 70oC is cooled at constant pressure until

Question:

A 10-kg mass of superheated refrigerant-134a at 1.2 MPa and 70oC is cooled at constant pressure until it exists as a compressed liquid at 20oC.
(a) Show the process on a T-v diagram with respect to saturation lines.
(b) Determine the change in volume.
(c) Find the change in total internal energy.