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JAMB Chemistry 2003 Question 1

Question 1

Mole Concept and Stoichiometry

What volume of oxygen is produced from the decomposition of 2 moles of KClO3 at s.t.p? [Molar volume of a gas at s.t.p = 22.4 dm3]

  1. A.22.4 dm3
  2. B.33.6 dm3
  3. C.44.8 dm3
  4. D.67.2 dm3
Show the answer and explanation

Answer: D (67.2 dm3)

Explanation

2KClO3 → 2KCl + 3O2, so 2 moles of KClO3 give 3 moles of O2. 3 × 22.4 = 67.2 dm3.