WAEC Chemistry 2018 Objective — Question 41
Question 41 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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What is the relative molecular mass of a compound which has empirical formula CH₂O? [H=1.0, C=12.0, O=16.0]
- A. 42
- B. 45
- C. 126
- D. 180Correct
Explanation
Empirical formula mass CH₂O = 30. Testing the given options, only 180 is a whole-number multiple of 30 (180=30×6), so the molecular mass is 180.
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