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Question:

The value of ΔfGø for formation of Cr2O3 is - 540 kJmol-1 and that of Al2 O3 is - 827 kJmol-1. Is the reduction of Cr2O3 possible with Al?

Answer:

The value of ΔfGø for the formation of Cr2O3 from Cr (-540 kJmol-1) is higher than that of Al2 O3 from Al (-827 kJmol-1). Therefore, Al can reduce Cr2O3 to Cr. Hence, the reduction of Cr2O3 with Al is possible.

Alternatively,

Subtracting equation (ii) from (i), we have

As for the reduction reaction of Cr2O3 by Al is negative, this reaction is possible.


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