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JAMB Chemistry 1990 Question 6

Question 6

Mole Concept and Stoichiometry

The volume occupied by 1.58 g of a gas at s.t.p is 500 cm3. What is the relative molecular mass of the gas? [G.M.V at s.t.p = 22.40 dm3].

  1. A.28
  2. B.32
  3. C.44
  4. D.71
Show the answer and explanation

Answer: D (71)

Explanation

One mole occupies 22 400 cm3, so molar mass = 1.58 × 22 400 ÷ 500 ≈ 71.