Given:   R-134a is compressed with no heat transfer in a piston-cylinder assembly from 30 lbf/in2, 20oF to 160 lbf/in2

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Given:   R-134a is compressed with no heat transfer in a piston-cylinder assembly from 30 lb_f/in², 20^oF to 160 lb_f/in². The mass of refrigerant is 0.04 lb_m.  For the refrigerant as the system, W = -0.56 Btu.  Kinetic and potential energy changes may be neglected.  

Find:  The final temperature (^oF).