JAMB - Physics (1991 - No. 38)
The electrochemical equivalent of platinum is 5.0 x 10-7kgC-1 to plate-out 1.0kg of platinum, a current of 100A must be passed through an appropriate vessel for
5.6 hours
56 hours
1.4 x 104 hours
2.0 x 104 hours
Vysvětlení
m = Itz
1 = 100 x 5 x 10-7 x t
t = 20,000sec
= 5.6hrs
1 = 100 x 5 x 10-7 x t
t = 20,000sec
= 5.6hrs