In the manufacture of Al

CHEMISTRY · Multi-part · A Level · Chemistry · Electrode potentials · Electrode potentials

Problem

In the manufacture of Al, Al2O3\text{Al}_2\text{O}_3 is dissolved in Na3AlF6\text{Na}_3\text{AlF}_6 at 300 K and electrolysed between Al and carbon electrodes following the net reaction, 2Al2O3 (solution)+3C→4Al(l)+3CO2(g)2\text{Al}_2\text{O}_3 \text{ (solution)} + 3\text{C} \rightarrow 4\text{Al}(l) + 3\text{CO}_2(g) (1) write the reaction of each electrode. (2) Calculate the minimum voltage required between the electrodes if the Gibbs free energy change for the above reaction is −1370 kJ mol−1-1370 \text{ kJ mol}^{-1} .

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