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JAMB Chemistry 2005 Question 36

Question 36

Mole Concept and Stoichiometry

The density of a certain gas is 1.98gdm−3 at s.t.p. What is the molecular mass of the gas? [Molar volume of a gas at s.t.p. = 22.4 dm3]

  1. A.44.0 g
  2. B.54.0 g
  3. C.26.0 g
  4. D.31.0 g
Show the answer and explanation

Answer: A (44.0 g)

Explanation

Molar mass = density × molar volume = 1.98 × 22.4 ≈ 44 g.