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Heat of combustion of ethanol at constan...

Heat of combustion of ethanol at constant pressure and at temperature `"T K"` is found to be `-qJ" mol"^(-1)`. Hence, heat of combusion (in J `mol^(-1)`) of ethanol at the same temperature 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) rarr 3H_(2)O(r)`
`Deltan_(3)=2-3=-1`
so `DeltaU=DeltaH-Deltan_(g)RT`
`=-q+RT`
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RESONANCE ENGLISH-THERMODYNAMICS-exercise-3 part-1 Advanced level Solutions
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