1.

The Gibbs energy for decomposition of Al_(2)O_(3) at 500^(@)C is as follows: 2/3Al_(2)O_(3)to4/3Al+O_(2),""DeltaG=+966kJ The potential difference needed for electrolytic reduction of Al_(2)O_(3) at 500^(@)C is at least

Answer»

4.5 V
3.0 V
2.5 V
5.0 V

Solution :`underset(+6)(Al_(2)O_(3))tounderset(0)(2AL)+3/2O_(2),DeltaG=3/2xx966kJmol^(-1)`, N = 6. Then apply `DeltaG=-nFE`


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