6.27 Predict conditions under which Al might be expected to reduce MgO.

(Hint: See Intext question 6.4)

Above 1350°C, the standard Gibbs free energy of formation of $A{l}_{2}{O}_{3}$ from Al is less than that of MgO from Mg. Therefore, above 1350°C, Al can reduce MgO.

Intext Questions