The reaction, Cr2O3 +2 AI rarr AI2 O3 +...

The reaction, `Cr_2O_3 +2 AI rarr AI_2 O_3 +2 Cr ` `(DeltaG^(square)=-421 kJ)` is thermodynamically feasible as is apparent from the Gibbs energy value. Why does it not take place at room temperature?

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The reaction, `Cr_2O_3 +2 AI rarr AI_2 O_3 +2 Cr ` `(DeltaG^(square)=-421 kJ)` is thermodynamically feasible as is apparent from the Gibbs energy value. Why does it not take place at room temperature?

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