WAEC Chemistry 2021 Objective — Question 4

Question 4 of 50 from the West African Examinations Council (WAEC) Chemistry 2021 Objective paper, with the correct answer and a full explanation.

4. What is the relative molecular mass of the compound below? (benzene ring with -C(=O)-O-CH3 substituent) [H=1.0; C=12.0; O=16.0]

• A. 137
• B. 136Correct
• C. 64
• D. 59

Explanation

The molecular formula is C8H8O2. R.M.M. = (12×8)+(1×8)+(16×2) = 96+8+32 = 136.

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