First slide

Faraday's Laws

Question

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

Difficult

A

579 C
B

5790 C
C

57900 C
D

579000 C

Solution

Moles of nitrobenzene used in the reaction $= \frac{12.3}{123} = 0.1$
H₂ required for reduction = 0.1 x 3 = 0.3 mol
Amount of charge required to liberate 0.3 mole of hydrogen
= 2 x 96500 x 0.3 = 57900 C.

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