2.65 mol of an ideal gas with CV, m=3R/2 undergoes the transformations described in the following list from an initial state described by T=380.K and P=8.00bar. The gas undergoes a reversible adiabatic expansion until the final pressure is one-fourth its initial value. The gas undergoes an adiabatic expansion against a constant external pressure of 2.00 bar until the final pressure is one-fourth its initial value. The gas undergoes an expansion against a constant external pressure of zero bar until the final pressure is equal to one-fourth of its initial value.