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Question

The Gibbs energy for the decomposition of Al2O3 at 500oC is as follows:
23Al2O343Al+O2;ΔrG=+96kJ
The voltage needed for the electrolytic reduction of aluminium oxide (Al2O3) at 500oC is at least:

A
4.5V
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B
3.0V
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C
2.5V
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D
5.0V
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Solution

The correct option is A 2.5V
ΔG=nFEon=4
For decomposition of Al2O3, 4 moles of electrons are transferred.

F=Faraday=96500 C/mole.

E0=ΔGnF=96×10004×96500

=2.48V2.5V

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