WAEC Chemistry 2015 Objective — Question 40
Question 40 of 50 from the West African Examinations Council (WAEC) Chemistry 2015 Objective paper, with the correct answer and a full explanation.
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A compound has an empirical formula CH₂O and molecular mass of 90. Determine its molecular formula. [H=1.00, C=12.0, O=16.0]
- A. C₄H₁₀O₂
- B. C₃H₁₀O₂
- C. C₃H₆O₃Correct
- D. C₇H₂O₄
Explanation
Empirical formula mass = 30. n = 90/30 = 3. Molecular formula = (CH₂O)₃ = C₃H₆O₃.
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