Question

During the electrolysis of fused MgO, how much magnesium can be produced from a charge of 3.00 Faradays

Answer 1

The mass of magnesium, Mg that can be produced from the electrolysis of MgO using 3 faradays is 36 g

In the electrolyte, we have

Mg²⁺ + 2e —> Mg

Recall:

1 electron = 1 Faraday

1 mole of Mg = 24 g

From the balanced equation above,

2 Faradays produced 24 g of Mg.

• With the above information, we can obtain the mass of magnesium, Mg that will be produced by using 3 faradays. This can be obtained as follow:

From the balanced equation above,

2 Faradays produced 24 g of Mg

Therefore,

3 Faradays will produce = (3 × 24) / 2 = 36 g of Mg

Thus, the mass of Mg obtained by using 3 faradays is 36 g

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