Question

For the reaction,
`A(s)+3B(s)to4C(s)+D(l)`
`DeltaH` and `DeltaU` are related as-
A. `DeltaH = DeltaU`
B. `DeltaH = DeltaU + 3RT`
C. `DeltaH=DeltaU + RT`
D. `DeltaH=DeltaU-3RT`

Answer 1

Correct Answer - D
`A(s)+3B(g)rarr4C(s)+D(l)`
`Deltan_(g)=0-3=-3, DeltaH=DeltaE+Deltan_(g)RT [because DeltaE=DeltaU]`
`thereforeDeltaH=DeltaU+(-3)(RT)`
`DeltaH=DeltaU-3(RT), DeltaH=DeltaU-3RT`.