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

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% of iron by mass = 69.9 % % of oxygen by mass = 30.1 % Relative moles of iron in iron oxide: Relative moles of oxygen in iron oxide: Simplest molar ratio of iron to oxygen: = 1.25: 1.88 = 1: 1.5 2: 3 ∴ The empirical formula of the iron oxide is Fe2O3.
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% of iron by mass = 69.9 % [Given] % of oxygen by mass = 30.1 % [Given] Relative moles of iron in iron oxide: Relative moles of oxygen in iron oxide: Simplest molar ratio of iron to oxygen: = 1.25: 1.88 = 1: 1.5 2: 3 ∴ The empirical formula of the iron oxide is Fe2O3. read less
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