i) Air undergoes a process from T1 = 645 K, p1 = 12 bar to a final state where s2 = s1, p2 =1 bar. Employing the ideal gas model, determine the final temperature T2, in oF.
ii) saturated water vapor at 1MPA is expanded to 0.1MPA during an isentropic process. What are the final temperature and the quality of the water?