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WAEC Chemistry 2020 Paper

Question : 6

Total: 49

Solution:

Concept:

Electrolysis relates the quantity of charge passed to the mass of substance deposited using Faraday's laws.

Explanation:

For silver, the cathode reaction is:

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

Thus,

1

mole of silver requires

1

mole of electrons.

Mass of

1

mole of Ag

= 108

Charge for

1

mole of electrons

= 96500

So,

96500

C deposits

108

g of silver.

For

24125

C, the mass deposited is:

\text{Mass} = \frac{108 \times 24125}{96500}

\text{Mass} = \frac{108 \times 1}{4} = 27\text{ g}

Answer:

27

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