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JAMB Chemistry 1982 Question 1

Question 1

Gas Laws

A mixture contains 20 cm3 of hydrogen, 35 cm3 of oxygen, 15 cm3 of carbon monoxide and 10 cm3 of nitrogen at S.T.P. Which of the following gives the mole fraction of hydrogen in this mixture?

  1. A.0.02
  2. B.0.16
  3. C.0.20
  4. D.0.25
  5. E.20
Show the answer and explanation

Answer: D (0.25)

Explanation

For gases at the same conditions, volume is proportional to moles. Total volume = 80 cm3, so the mole fraction of hydrogen = 20/80 = 0.25.