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Question

The difference in the heat of reaction at constant volume and at constant pressure for the given reaction is:

CH4(g)+O2(g)Mn2+−−HCOOH(l)+H2(g)



Your Answer
A
–RT
Correct Answer
B
RT
Your Answer
C
-2RT
Your Answer
D
– 3RT

Solution

The correct option is B RT
We know that the heat of reaction at a constant volume is given by the internal energy of the system whereas the heat of reaction at a constant pressure is given by the enthalpy of the system.
Again,

ΔH=ΔU+ΔngRT
ΔUΔH=ΔngRT
ΔUΔH=(12)RT
ΔUΔH=RT

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