The Gibbs energy for the decomposition of Al2O3 at 500oC is as follows : ${2 \over 3}A{l_2}{O_3}$ $\to$ ${4 \over 3}Al + {O_2}$, ${\Delta _r}G$ = + 966 kJ mol–1 The potential difference needed for electrolytic reduction of Al2O3 at 500oC is at least :

Question

The Gibbs energy for the decomposition of Al₂O₃ at 500^oC is as follows :

${2 \over 3}A{l_2}{O_3}$ $\to$ ${4 \over 3}Al + {O_2}$, ${\Delta _r}G$ = + 966 kJ mol^–1

The potential difference needed for electrolytic reduction of Al₂O₃ at 500^oC is at least :

4.5 V

3.0 V

2.5 V

5.0 V

Solution

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