If `Delta E` is the heat of reaction for `C_(2)H_(5)OH_((1))+3O_(2(g)) rarr 2CO_(2(g))+3H_(2)O_((1))` at constant volume, the `Delta H` (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+ Deltan_(g)RT`
where, `Deltan_(g)` = total number of moles of gaseous product-total number of moles of gaseous reactant.
=2-3=-1
So, `DeltaH=DeltaE-RT`