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The the work
should be the area bounded by the PV graph (I hope). The problem is that
for the numbers I am using dU and W do not agree.
P1 = 200 kPa ; V1=1 m^3; n = 0.04 mol; T1 = 600K
P2 = 103 kPa ; V2 = 1.6 m^3; n = 0.04 mol ; T2 = 496K
delta U = -51 J area under graph (counting squares ) 88J