The electrochemical equivalent of platinum is 5.0 x 10 -7 kgC -1 to plate-out 1.0kg

PHYSICS

JAMB 1991

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

A. 5.6 hours
B. 56 hours
C. 1.4 x 10^{4 hours}
D. 2.0 x 10^{4 hours}

Correct Answer: A. 5.6 hours

Explanation

m = Itz

1 = 100 x 5 x 10^-7 x t

t = 20,000sec

= 5.6hrs

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