If `DeltaE` is the heat of reaction for `C_(2)H_(5)OH(l)+3O_(2)(g)to2CO_(2)(g)+3H_(2)O(l)` at constant volume, the `DeltaH` (heat of reaction at constant pressure), at constant temperature is

Options

A. `DeltaH=DeltaE+RT`
B. `DeltaH=DeltaE-RT`
C. `DeltaH=DeltaE-2RT`
D. `DeltaH=DeltaE+2RT`

Answer

B

Explanation

We know that, `DeltaH=DeltaE+DeltanRT`
where, `Deltan`=number of moles of gaeous products-number of moles of gaseous reactants=2-3=-1
so, `DeltaH=DeltaE-RT`