WAEC Chemistry 2023 Objective — Question 42
Question 42 of 50 from the West African Examinations Council (WAEC) Chemistry 2023 Objective paper, with the correct answer and a full explanation.
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How many moles are there in 3.0 g of O3? [O=16.0]
- A. 0.0093
- B. 0.0930
- C. 0.6250
- D. 0.0625Correct
Explanation
Molar mass of O3 = 16×3 = 48 g/mol. Mole = 3 g ÷ 48 g/mol = 0.0625 mol.
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