WAEC Chemistry 2022 Objective — Question 47
Question 47 of 50 from the West African Examinations Council (WAEC) Chemistry 2022 Objective paper, with the correct answer and a full explanation.
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If the molar mass of X(HCO3)2 is 162 g mol⁻¹, determine the relative atomic mass of X. [H=1.0, C=12.0, O=16.0]
- A. 40Correct
- B. 48
- C. 61
- D. 101
Explanation
X(HCO3)2 = X + 2(1+12+48) = X + 2(61) = X + 122 = 162, so X = 162 − 122 = 40.
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