The Gibbs energy for the decomposition of Al2O3 at 500oC is as follows: 2/3Al2O3→4/3Al+O2;ΔrG=+966 kJ/mol. The potential difference needed for electrolytic reduction of Al2O3 at 500oC is at least:
A
5.0V
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B
4.5V
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C
3.0V
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D
2.5V
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