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Calculate the quantity of electricity re...

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

Text Solution

Verified by Experts

Reaction involving reduction of nitrobenzene:
`C_(6)H_(5)NO_(2)+6H^(+)+6e rarr C_(6)H_(5)NH_(2)+2H_(2)O`
Molecular weight of `C_(6)H_(5)NO_(2)=123.`
The reaction shows that the amount of electricity required for the reduction of 123 g of nitrobenzene = 6 F
For the reduction of 12.3 g of nitrobenzene, the amount of electricity required `=(6xx12.3)/(123)=0.6F`
A sucrrent efficiency is `50%`, actual quantity of electricity required `=(0.6xx2)=1.2F=1.2xx96500=115800C`
`therefore" Energy consumed "="electricity in coulomb"xx"potential drop "`
`=(3xx115800)V.C=347400J`
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