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JAMB Chemistry 1991 Question 7

Question 7

Mole Concept and Stoichiometry

Calculate the volume of carbon (IV) oxide measured at s.t.p, produced when 1 kg of potassium hydrogen trioxocarbonate (IV) is totally decomposed by heat. [G.M.V. at s.t.p = 22.4 dm3, K = 39, O = 16, C = 12, H = 1].

  1. A.28 dm3
  2. B.56 dm3
  3. C.112 dm3
  4. D.196 dm3
Show the answer and explanation

Answer: C (112 dm3)

Explanation

2KHCO3 → K2CO3 + H2O + CO2: 200 g gives 22.4 dm3 of CO2, so 1000 g gives 5 × 22.4 = 112 dm3.