WAEC Chemistry 2020 Objective — Question 31
Question 31 of 50 from the West African Examinations Council (WAEC) Chemistry 2020 Objective paper, with the correct answer and a full explanation.
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What volume of oxygen at s.t.p. is required to burn completely 7.5 dm^3 of the methane according to the following equation? CH4(g) + 2O2(g) -> CO2(g) + 2H2O(g)
- A. 3.75 dm^3
- B. 7.50 dm^3
- C. 15.0 dm^3Correct
- D. 30.0 dm^3
Explanation
CH4+2O2->CO2+2H2O. Since 1 mole of CH4 requires 2 moles of O2, 7.5 dm^3 of CH4 will require 15.0 dm^3 of O2.
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