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JAMB Chemistry 2004 Question 7

Question 7

Gas Laws

A given volume of methane diffuses in 20s. How long will it take the same volume of sulphur (IV) oxide to diffuse under the same conditions? [C = 12, H = 1, S = 32, O = 16]

  1. A.5s
  2. B.20s
  3. C.40s
  4. D.60s
Show the answer and explanation

Answer: C (40s)

Explanation

By Graham's law, time ∝ √(molar mass). t = 20 × √(64/16) = 20 × 2 = 40 s.