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Question

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

A
347.4 kJ
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B
152.7 kJ
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C
273.2 kJ
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D
173.7 kJ
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Solution

## The correct option is A 347.4 kJThe reduction of Nitrobenzene can be written asC6H5NO2+6H++6e−→C6H5NH2+2H2OThe molar mass of Nitrobenzene = 123g123 gm of Nitrobenzene use 6 mol electrons for complete reaction12.3 gm of Nitrobenzene will use 0.6 mol electrons for complete reaction0.6 mole electron =0.6×96500=57900 CEfficiency is 50%Required charge =57900×2=115800 CEnergy =QV=(115800×3) J =347.4 kJHence, the correct option is A

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