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WAEC Chemistry 2016 Paper

Question : 35

Total: 50

The quality of electricity required to discharge 1 mole of univalent ion is

Solution:

Concept:

One mole of a univalent ion is discharged by exactly

1

Faraday of electric charge.

Explanation:

The charge required is given by

Q = nF

, where

n

is the number of moles of electrons transferred and

F = 96500\ \mathrm{C\,mol^{-1}}

is the Faraday constant.

For a univalent ion, the charge on the ion is

1

, so

n = 1

mole of electrons.

Therefore,

Q = 1 \times 96500\ \mathrm{C} = 96500\ \mathrm{C}

Answer:

96500\ \mathrm{C}

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