ElectrochemistryHard

Question

On the basis of information available from the reaction

4Al + 3O2 → 2Al2O3; ΔG = −965 kJ/ mol of O2

The minimum EMF required to carry out electrolysis of Al2O3 is

Options

A.0.833 V
B.2.5 V
C.5.0 V
D.1.67 V

Solution

$\Delta G_{cell} = - nFE_{cell} \Rightarrow - 965 \times 3 \times 10^{3} = - 12 \times 96500 \times E_{cell}$

$\therefore E_{cell} = 2.5\text{ V}$

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