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JAMB Chemistry 1992 Question 6

Question 6

Gas Laws

If 100 cm3 of oxygen pass through a porous plug in 50 seconds, the time taken for the same volume of hydrogen to pass through the same porous plug is [O = 16, H = 1].

  1. A.10.0 s
  2. B.12.5 s
  3. C.17.7 s
  4. D.32.0 s
Show the answer and explanation

Answer: B (12.5 s)

Explanation

By Graham's law time is proportional to √(molar mass): t = 50 × √(2/32) = 50 × 0.25 = 12.5 s.