WAEC Chemistry 2010 Objective — Question 43
Question 43 of 49 from the West African Examinations Council (WAEC) Chemistry 2010 Objective paper, with the correct answer and a full explanation.
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An organic compound contains 40.0% carbon, 6.7% hydrogen and 53.3% oxygen. What is the empirical formula of the compound? [O=16.0, C=12.0, H=1.0]
- A. A. C2HO
- B. B. CHO
- C. C. CH2OCorrect
- D. D. CHO2
Explanation
Dividing by molar mass: C: 40/12=3.3333, H: 6.7/1=6.7, O: 53.3/16=3.33125. Dividing by the smallest (3.3333): C:H:O ≈ 1:2:1. The empirical formula is CH2O.
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