In order to oxidise a mixture of one mole of each of and in acidic medium, the number of moles of required is :
is the n=factor of and not
In this compound, carbon is in oxidation state and is in oxidation state.
In acidic medium , is converted to and is converted to . So oxidation number of carbon changes from As, there are two carbon atoms, the net change in Number is and adding to this, the increase in oxidation state of iron, the final increase in Number is .
Hence n-factor of is .
= mole of
Total moles of