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FeO is 50 mole % Fe and 50 mole % O

FeO is 77.73 mass % Fe and 22.27 mass % O

mass fraction X = molar mass X / (total molar mass of compound)

mass % Fe = [Atomic Mass Fe] / ([atomic mass Fe] + [atomic mass O])

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Q: What is the percent composition of FeO?
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