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OpenStudy (anonymous):
How much iron is present in 2 . 99 g of iron(III) oxide
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OpenStudy (kira_yamato):
Proportion by mass Fe = 55.8(2)/(55.8(2) + 3(16.0) = 279/319 Mass of Fe = 2.99*279/319 ≈ 2.62 g
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