IIT 1990 Electrolysis Problem
Chemistry
Level
2
Calculate the quantity of electricity that would be required to reduce 12.3 g of nitro-benzene to aniline,if the current efficiency for the process is 50%.If the potential drop across the cell is 3 volts how much energy will be consumed?
Give answer in kJ.
The answer is 347.40.
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1 solution
N in nitro-benzene is in +3 oxidation state.N in aniline is in -3 oxidation state.
e- change =6 mole per 1 mole nitro-benzene
eq.wt. of nitro-benzene =123/6
No. of eq. of nitrobenzene =12.3/(123/6) =0.6 eq.
1F <=> 1 eq.wt.
Hence, 0.6 F is needed. But as 50 % efficiency is there 1.2 F is needed.
1.2F=115800 C
Energy consumed = qV=115800 C * 3 J =347.40 kJ.