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I believe the stability of Fe3O4 and Fe2O3 were mentioned in problem 9.81, and in that problem, it was important to write out the equation that involves the two of them, which is 4Fe3O4 + O2 -> 6Fe2O3. This Gibbs Free Energy for this forward reaction is negative and the reverse is positive, which means that the reaction that forms Fe2O3 is favorable and Fe2O3 is more stable.
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