An 80-L vessel contains 4 kg of refrigerant-134a at a pressure of 160 kPa. Determine (a) the temperature, (b) the quality, (c) the enthalpy of the refrigerant, and (d) the volume occupied by the vapor phase. P, kPa R-134a P= 160 kPa m = 4 kg 160 T=-15.60C v, = 0.0007435 v,=0.12355 U, mkg hy = 31.18 hy = 241.14 h, kJ/kg