Calculate the mass of oxygen produced when 2000 kg of aluminium oxide is completely electrolysed.​

Explanation:

Given that:

The mass of aluminium oxide Al₂O₃ = 2000 kg = 2000 000 g

Molar mass of Al₂O₃ = 101.96 g/mol

no of moles = mass / molar mass

no of moles of Al₂O₃ = 2000 000 g/ 101.96 g/mol

no of moles of Al₂O₃ = 19615.4 mol

From the reaction:

4Al + 3O₂  ⇒  Al₂O₃

To determine the moles of O₂ in Al₂O₃:

Then;

19615.4 mol * 3/2 mol of O₂ = 29423.1

The mass of oxygen now = 29423.1  × 32 g

= 941539.2 g

To kg;

= (941539.2 / 1000) kg

= 941.5 kg

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