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JAMB Chemistry 1999 Question 2

Question 2

Mole Concept and Stoichiometry

56.00 cm3 of a gas at s.t.p weighed 0.11 g. What is the vapour density of the gas? [Molar volume of a gas at s.t.p = 22.4 dm3]

  1. A.11.00
  2. B.22.00
  3. C.33.00
  4. D.44.00
Show the answer and explanation

Answer: B (22.00)

Explanation

Molar mass = 0.11 × 22400/56 = 44 g mol−1. Vapour density = molar mass ÷ 2 = 22.