WAEC Chemistry 2018 Objective — Question 10
Question 10 of 50 from the West African Examinations Council (WAEC) Chemistry 2018 Objective paper, with the correct answer and a full explanation.
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An organic compound has the empirical formula CH. If its molar mass is 42 gmol⁻¹, what is its molecular formula? [H=1.0, C=12.0]
- A. C₂H₄
- B. C₃H₆Correct
- C. C₃H₈
- D. C₄H₈
Explanation
Empirical formula mass CH = 13. n = 42/14... using (CH)n=42 → n=42/13≈3, so molecular formula = C₃H₆ (mass 42).
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