WAEC Chemistry 2021 Objective — Question 3
Question 3 of 50 from the West African Examinations Council (WAEC) Chemistry 2021 Objective paper, with the correct answer and a full explanation.
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3. The ratio of carbon atoms to hydrogen atoms in a hydrocarbon is 1:2. If its molecular mass is 56, what is its molecular formula?
- A. C3H6
- B. C4H8Correct
- C. C2H4
- D. CH2
Explanation
Empirical formula CH2 (mass 14). (CH2)n=56 → 14n=56 → n=4, giving molecular formula C4H8.
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