How many moles of electrons are given by
(i) 9860 C (ii) a current of 1.5 A for 30 s ?

Explanation

(i) 96500 C of electricity = 1 mol of electrons
8960 C of electricity = `(1)/(96500) xx 8960`
`= 0.0928` mol electrons .
(ii) Quantity of electricity , `Q = I xx t = 1.5 xx 30 = 45 C`
Now , 96500 C of electricity = 1 mol of electrons
`therefore` 45 C of electricity = `(1)/(96500) xx 45 = 4.66 xx 10^(-4)` mol electrons .