WAEC Chemistry 2024 Objective — Question 24
Question 24 of 50 from the West African Examinations Council (WAEC) Chemistry 2024 Objective paper, with the correct answer and a full explanation.
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24. The percentage by mass of oxygen in MgSO₄.7H₂O is [Mr = 246]
- A. 26.0 %
- B. 45.5 %
- C. 71.5 %Correct
- D. 84.0 %
Explanation
MgSO₄.7H₂O has 11 oxygen atoms. %oxygen = (16×11)/246 × 100% = 176/246 × 100% ≈ 71.5%.
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