Physics JAMB

If a current of 2.5A flows through an electrolyte for 3 hours and 1.8g of a substance is deposited; what is the mass of the substance that will be deposited if a current of 4A flows through it for 4.8 hours?

A. 2.4g
B. 3.2g
C. 4.6g
D. 4.8g

Correct Answer:

Option C – 4.6g

Explanation

First, let’s find z

z = M/It

z = 1.8/{2.5×(3×60×60)}

Therefore, the new M equals

M = zIt

M = (1.8×4×4.8×60×60)/(2.5×3×60×60)

M = 4.6g

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