Question

The amount of charge in F (Faraday) required to obtain one mole of iron from $Fe_3O_4$ is ______ . (Nearest integer)

Answer 1

For $Fe_3O_4,\ x=+\frac 83$
Where, x is oxidation state of $Fe$.
$Fe_3O_4+8H++8e^−→3Fe+4H_2O$
Charge required $=\frac 83×F$
$=\frac {8F}{3}$
$≃3F$
So, the answer is $3F$.