5.50 moles of an ideal gas are expanded from 400 K and an initial pressure of 5.00 bar to a final pressure of 1.00 bar, and CP,m = 5/2R. Calculate w for the following two cases:

a) The expansion is isothermal and reversible.

b) The expansion is adiabatic and reversible.

c.) Calculate P,V and T for initial and final states of each process and produce a plot of the two processes on a P,V diagram. Without resorting to equations, explain why the result for part (b) is greater than or less than the result for part (a).