Which is more stable, Fe3O4 or Fe2O3?

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Which is more stable, Fe3O4 or Fe2O3?

Postby jenshan » Sun Jan 24, 2016 3:00 pm

I don't understand the answer keys reasoning: Fe2O3 is thermodynamically more stable, because Gr for the interconversion from Fe3O4 to Fe2O3 is negative. delta G for Fe3O4 is more negative than Fe2O3, shouldn't that mean that it is more thermodynamically stable?

Shaye Busse 3B
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Re: Which is more stable, Fe3O4 or Fe2O3?

Postby Shaye Busse 3B » Sun Jan 24, 2016 5:57 pm

The reason for this comes when looking at what G stands for. G is a measure of Gibbs Free Energy, or a measure involving the changes of heat and entropy in relation to temperature. When there is no change in heat or entropy, or in the most stable state possible, the delta G is equal to 0. The reason the answer is the one with a G closest to zero is because a G value of zero is most stable.

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