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The overall equation for the electrolysis of aluminium oxide is:

2Al2O3

4Al + 302

Calculate the mass of oxygen produced when 2000 kg of aluminium oxide is

completely electrolysed.

Relative atomic masses (A):

O = 16

Al = 27


Sagot :

941539.2 g of mass of oxygen is produced when 2000 kg of aluminium oxide is completely electrolysed.

What is electrolysis?

Electrolysis is the process by which electric current is passed through a substance to effect a chemical change.

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

Molar mass of Al₂O₃ = 101.96 g/mol

no of moles = [tex]\frac{mass }{ molar \;mass}[/tex]

no of moles of Al₂O₃ =  [tex]\frac{2000 000 g}{101.96 g/mol}[/tex]

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 X [tex]\frac{3}{2}[/tex] mol of Oâ‚‚ = 29423.1

The mass of oxygen now = 29423.1  × 32 g

= 941539.2 g

Hence,  941539.2 g of mass of oxygen is produced when 2000 kg of aluminium oxide is completely electrolysed.

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