Question

Aluminium oxide is electrolysed to produce aluminium. Oxygen gas is produced at the carbon anode which is then burnt according to the following reaction :
C+ O₂ → CO₂
The relative atomic masses of Al = 27, C = 12 and 0 = 16.

For each 16 kg of oxygen used calculate:
(a) mass of carbon burnt
(b) the mass of carbon dioxide obtained
(c) calculate the mass of aluminium produced from 10.2 kg of aluminium oxide according to the reaction :
2Al₂O³ → 4Al + 30₂
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Answer 1

Answer:

Number of equivalents of oxygen =

5.6

201.6

=36

(Equivalent volume of oxygen =5.6 litre at NTP)

∴ Number of equivalents of Al=36

Mass of aluminium =36×9 g

Number of moles of aluminium =

27

36×9

=12.

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