WAEC Chemistry 2019 Objective — Question 28
Question 28 of 50 from the West African Examinations Council (WAEC) Chemistry 2019 Objective paper, with the correct answer and a full explanation.
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An organic compound contains 72% carbon, 12% hydrogen and 16% oxygen by mass. What is the empirical formula of the compound? [H=1.0, C=12.0, O=16.0]
- A. C3H8O
- B. C6H12OCorrect
- C. C6H12O2
- D. C12H12O11
Explanation
Moles: C=72/12=6, H=12/1=12, O=16/16=1. Ratio C:H:O = 6:12:1, giving empirical formula C6H12O.
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