Ten pounds of oxygen are compressed from 20 psia and 50F in a process governed by the

Question:

Ten pounds of oxygen are compressed from 20 psia and 50°F in a process governed by the equation PV n = const, where the pressure is in psfa and the volume is in ft3. The final temperature in this process is 100°F. Calculate the work done if
a) n = 1.4,
b) n = 1.8,
c) n = 2.