How many coulombs are required in order to reduce 12.3 g of nitrobenzene to aniline

C₆H₅NO₂   +    3H₂    $\underset{ }{\to }$C₆H₅NH₂   +    2H₂O

In this reaction, the oxidation state of nitrogen changes from +3 to -3. 

The number of electrons required is equal to 6 moles i.e., 6 Faraday.

So the charge required to reduce 123g of nitro benzene is 6 x 96500 C and 

for 12.3 g of nitro benzene it is 57900 C