Question

Calculate the mass of aluminium deposited at cathode when 193 C of current is passed through molten electrolyte containing dissolved alumina. Given molar mass of All=27g/mol, 1F=96500C/mol.

Answer 1

Given,

$Q=193C$

$F=96500C/mol$

$M=27g/mol$

$nf=3$

Using the relation, $m=\frac{Q\times M}{F\times nf}$, we get

$\Rightarrow m=\frac{193\times 27}{3\times 96500}$

$\Rightarrow m=0.018g$