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)

A
–RT
B
RT
C
-2RT
D
– 3RT

Solution

## The correct option is B RTWe 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 ⇒ΔU−ΔH=−ΔngRT ⇒ΔU−ΔH=−(1−2)RT ⇒ΔU−ΔH=RT

Suggest corrections