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JAMB Chemistry 1993 Question 3

Question 3

Mole Concept and Stoichiometry

How many moles of oxygen molecules would be produced from the decomposition of 2.5 moles of potassium trioxochlorate (V)?

  1. A.2.50
  2. B.3.50
  3. C.3.75
  4. D.7.50
Show the answer and explanation

Answer: C (3.75)

Explanation

2KClO3 → 2KCl + 3O2, so 2 mol of KClO3 give 3 mol of O2. 2.5 mol gives 2.5 × 3/2 = 3.75 mol.