AIPMT 2008 Physics and Chemistry Paper

C5H12(g)+8O2(g)→5CO2(g)+6H2O(ℓ)
=−3387.5‌kJ
The standard free energy change of elementary substances is taken as zero.
For the fuel cell, the complete cell reaction is :
This reaction is the combination of the following two half reactions :
C5H12(g)+10H2O(ℓ)⟶5CO2(g)+32H++32e
As the number of electrons exchanged is 32 here, so n=32
∆G∘=−nFE∘
On solving, we get
E∘=1.09698V