ChemistryChemical combinationWAEC
A compound contains 40% carbon, 6.7% hydrogen and 53.3% oxygen by mass. Find its empirical formula. [C = 12, H = 1, O = 16]
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Answer: B. CH₂O
Mole ratio C : H : O = 40/12 : 6.7/1 : 53.3/16 = 3.33 : 6.7 : 3.33 = 1 : 2 : 1, so CH₂O.
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