Chemistry - Electrochemistry Question with Solution | TestHub

The Gibbs energy for the decomposition of ${\mathrm{Al}}_2{\mathrm{O}}_3$ at $500\mathrm{C}$ is as follows : $\frac{2}{3}{\mathrm{Al}}_2{\mathrm{O}}_3\to \frac{4}{3}\mathrm{Al}+{\mathrm{O}}_2,{\Delta }_{r}G=+940\mathrm{kJ}{\mathrm{mol}}^{-1}$ The potential difference needed for the electrolytic reduction of aluminium oxide at $500^{\circ }\mathrm{C}$ should be at least :