WAEC Chemistry 2012 Objective — Question 6
Question 6 of 50 from the West African Examinations Council (WAEC) Chemistry 2012 Objective paper, with the correct answer and a full explanation.
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2H2(g) + O2(g) → 2H2O(g). In the reaction above, what volume of hydrogen would be left over when 300cm³ of oxygen and 1000cm³ of hydrogen are exploded in a sealed tube?
- A. 200cm³
- B. 400cm³Correct
- C. 600cm³
- D. 700cm³
Explanation
From the equation, mole ratio of H2:O2 = 2:1. 300cm³ of oxygen will react with 600cm³ of hydrogen. Excess hydrogen = (1000−600)cm³ = 400cm³.
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