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Find the formula for the compound that contains 72.40% iron and 27.60% oxygen.
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Find the formula for the compound that contains 72.40% iron and 27.60% oxygen.

User Atwellpub
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Oxygen = 16
Iron = 55.8
16 x 27.6% = 4.4 /4 = 1.1
55.8 x 72.4% = 40.4 /4 = 10.1
1 oxygen and 10 iron, so Fe10 O

User Akiraspeirs
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