WAEC Chemistry 2021 Objective — Question 37
Question 37 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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37. An element, Q, contains 69.0% of 63Q and 31% of 65Q. What is the relative atomic mass of Q?
- A. 63.0
- B. 63.6Correct
- C. 65.0
- D. 69.0
Explanation
R.A.M = [(63×69)+(65×31)]/100 = (4347+2015)/100 = 63.62 ≈ 63.6.
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