Use data from Appendix D (Table D 2) to estimate the minimum voltage required to electrolyze Al 2 O 3 in the Hall Hroult process, reaction (21 25) Use f G Al 2 O 3 (l) 1520 kJ mol 1 Show that the oxidation of the graphite anode to CO 2 (g) permits the electrolysis to occur at a lower voltage than i...

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Use data from Appendix D (Table D-2) to estimate the minimum voltage required to electrolyze Al 2

Question:

Use data from Appendix D (Table D-2) to estimate the minimum voltage required to electrolyze Al₂O₃in the Hall-Héroult process, reaction (21.25). Use Δ_fG°[Al₂O₃(l)] = –1520 kJ mol^–¹. Show that the oxidation of the graphite anode to CO₂(g) permits the electrolysis to occur at a lower voltage than if the electrolysis reaction were Al₂O₃(l) → 2 Al(l) + ³/₂O₂(g).