Chemistry - Electrochemistry Question with Solution | TestHub

The Gibbs energy for the decomposition of ${\mathrm{Al}}_2{\mathrm{O}}_3$ at $500^{\circ }\mathrm{C}$ is as follows : $$\frac{2}{3}{\mathrm{Al}}_2{\mathrm{O}}_3\to \frac{4}{3}\mathrm{Al}+{\mathrm{O}}_2,{\Delta }_{\mathrm{r}}\mathrm{G}=+966\mathrm{kJ}{\mathrm{mol}}^{-1}$$ The potential difference needed for electrolytic reduction of ${\mathrm{Al}}_2{\mathrm{O}}_3$ at $500^{\circ }\mathrm{C}$ is at least