Calculate charge in interanl energy for a gas under going from state-I
`(300 K, xx 2 xx10^(-2) m^(3))` to state -II `(400 K, 4 xx 10^(-2) m^(3))` for one mol .of vanderwaal gas.
`[C_(V)=121J//K//"mole"]`
`{Given : ((delU)/(delV))_(T)=T((delP)/(delT))_(V)-P`
`C_(V)=12 J//K//mol`
`a=2 J .m.//mol^(2)}`

Explanation

`DeltaU= C_(V)(T_(2)-T_(1))+a((1)/(V_(1))-(1)/(V_(2)))=C_(V)(100)+a((1)/(4))xx10^(2)=12xx100+2((1)/(4))xx100=125`