Calculate the quantity of electricity that would be required to reduce 12.3g of nitrobenzene to aniline, if current efficiency is 50% . If the potential drops across the cell is 3.0V, how much energy will be consumed ?

Explanation

`C_6H_5NO_2+6H^+ +6e to C_6H_5NH_2+2H_2O`
`N^(3+)+6e to N^(3-)`
`:.` Eq. wt. of nitrobenzen `=M/6=(123)/(6)`, since current efficiently is 50% `:. i=(50i_0)/(100)`
Now `w=(Eit)/(96500)" "12.3=(123xxixxtxx50)/(6xx100xx96500)`
`:. Ixxt=115800` coloumb
Now energy used =`QxxV=115800xx3=347 kJ`