8. (Example 3-5) An 80-L vessel contains 4 kg of refrigerant-134a at a pressure of 160 kPa. Determine (a) thetemperature, (b) the quality, (c) the enthalpy of the refrigerant, and

(d) the volume occupied by the vaporphase. (Please try to solve this problem without looking at the solution first) (20 pts)