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Determine the empirical formula of an ox...

Determine the empirical formula of an oxide of iron which has 69.9% iron and 30.1% dioxygen by mass.

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The ratio of Fe and O atoms = 0.67 : 1
Multiply with 3 to make integer = 2 : 3
Empirical formula of oxide of iron = `Fe_(2)O_(3)`
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