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1.5 moles of a real gas changes its stat...

1.5 moles of a real gas changes its state from state A (3bar, 2 L, 200 K) to state b `(3 bar, 5 L, 300 k)` through isobaric process. It is then taken to state C `(4bar, 10 L 400 K )` such that `DeltaU_(BC)=127` Joules. Calculate value of `DeltaU_(AC)` in joules.
[Given : `C _(p,m) of gas = 4 R and R=8.3JK^(-1)mol^(-1)]`

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