1.

The Gibb's energy for the decomposition of Al_(2)O_(3) at 500^(@)C is as follows (2)/(3)Al_(2)O_(3)to(4)/(3)Al+O_(2),Delta_(r)G=+966kJmol^(-1) The potential difference needed for electrolytic reduction of Al_(2)O_(3) at 500^(@)C is at least

Answer»

5.0V
4.5V
3.0V
2.5V

Solution :`DeltaG=-nE^(o)F,n=4,F=96500cb`
`E^(0)=-(966xx1000)/(4xx96500)=-2.5V`


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