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JAMB Chemistry 2024 Paper

Question : 62

Total: 138

Solution:

Concept:

The same quantity of electricity liberates chemically equivalent amounts of different substances.

Explanation:

For silver:

\mathrm{Ag^+ + e^- \rightarrow Ag}

1

mole of Ag requires

96500

Charge needed to liberate

16.0

g of Ag is

Q = \frac{16.0}{108} \times 96500 = 14296.30

This same charge is used for magnesium:

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

2 \times 96500 = 193000

C liberates

24

g of Mg.

Mass of Mg liberated is

m = \frac{14296.30 \times 24}{193000} = 1.78

Answer:

D. 1.78 g

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