Question

For the gaseous reaction involving the complete combustion of iso-butane
A. `DeltaH=DeltaE`
B. `DeltaHgtDeltaE`
C. `DeltaH=DeltaE=0`
D. `DeltaHltDeltaE`

Answer 1

Correct Answer - B
The gas phase combustion of isobutane `(C_(4)H_(10))` represented as
`C_(4)H_(10)(g)+13//2O_(2)(g)to4CO_(2)(g)+5H_(2)O(g)`
`Deltan_(g)=9-((13)/(2)+1)=9-(15)/(2)=+(3)/(2)`
Since `Deltan_(g)=+ve`
Thus `DeltaH gt E`