Refrigerant 134a is compressed with no heat transfer in a piston-cylinder assembly from 30 lbf/in.2 , 20°F to 160 lbf/in.2 The mass of refrigerant is 0.04 lb. For the refrigerant as the system, W = -0.56 Btu. Kinetic and potential energy effects are negligible. Determine the final temperature, in F.