WAEC Chemistry 2024 Objective — Question 19
Question 19 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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19. Consider the reaction C₃H₈(g) + 5O₂(g) → 3CO₂(g) + 4H₂O(l). If 0.1 mole of C₃H₈(g) was completely burnt, what volume of CO₂(g) would be produced at stp? [molar volume at stp = 22.4 dm³mol⁻¹]
- A. 6.72 dm³Correct
- B. 2.24 dm³
- C. 0.30 dm³
- D. 0.10 dm³
Explanation
0.1 mol C₃H₈ produces 0.3 mol CO₂ (1:3 ratio). Volume = 0.3 × 22.4 dm³ = 6.72 dm³.
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