Process I is adiabatic reversible
Process II is a reversible isothermal process
Process I – (Adiabatic Reversible)
∆U = -1800 R
WI = ∆U = -1800R
Process II – (Reversible Isothermal Process)
T1 = 900 K
Calculation of T2 after the reversible adiabatic process
–1800R = nCv(T2 – T1)
T2 = 180 K
WII = –nRT2 In = W