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The composition of a sample of wustite i...

The composition of a sample of wustite is `Fe_(0.93)O_(1.00)`. What percentage of iron is present in the form of `Fe(III)`?

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Let the moles of Fe in FeO and `Fe_2O_3` be `n_1`, and `n_2` respectively. Thus,
moles of Fe / moles of O
` = (n_1 +n_2)/(n_1 + (3n_2)/(2)) = 0.93`
15.05%
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