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

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

Prashant Kotian · Accepted Answer

Correct answer: B. The given ΔG is -965 kJ per mole of O2. The oxidation of 1 mole of O2 from O^2- involves the transfer of 4 electrons, so n = 4. Using the relation ΔG = -nFE, we get -965000 J = -4 * 96500 * E. Solving for E gives E = 965000 / (4 * 96500) = 10 / 4 = 2.5 V. Therefore, correct answer is B.

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