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JAMB Chemistry 2014 Paper

Question : 23

Total: 45

How many faraday of electricity is required to produce 0.25 mole of copper?

Solution:

Concept:

The quantity of electricity needed depends on the number of electrons involved in reducing copper ions to copper metal.

Explanation:

For copper deposition, the ionic half-equation is:

\mathrm{Cu}^{2+} + 2e^- \rightarrow \mathrm{Cu}

So,

1

mole of copper requires

2

faradays of electricity.

Therefore,

0.25

mole of copper requires:

0.25 \times 2 = 0.50 \text{ F}

Answer:

0.50

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