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Heat of combustion of ethanol at constan...

Heat of combustion of ethanol at constant pressure and at temperature TK is found to be `-q J" mol"^(-1)`. Hence, heat of combustion (in J `mol^(-1)`) of ethanol at the same temperature and at constant volume will be :

A

RT - q

B

`-(q+RT)`

C

q - RT

D

q + RT

Text Solution

Verified by Experts

The correct Answer is:
A

`C_(2)H_(5)OH(l)+3O_(2)(g)rarr2CO_(2)(g)+3H_(2)O(l)`
`Deltan_(g)=2-3=-1`
`DeltaH=DeltaU+Deltan_(g)RT`
`DeltaU=DeltaH+RT=RT-q`
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