Practice question
Question
A compound contains 26.67% carbon, 2.22% hydrogen, and 71.11% oxygen by mass. What is its empirical formula? (Atomic masses: C = 12, H = 1, O = 16)
Explanation
For 100 g: C = 26.67 g, H = 2.22 g, O = 71.11 g. Moles: C ≈ 2.22, H = 2.22, O ≈ 4.44. Ratio = 1 : 1 : 2; empirical formula = CHO₂.
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