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JAMB Chemistry 1989 Question 6

Question 6

Gas Laws

What is the partial pressure of hydrogen gas collected over water at standard atmospheric pressure and 25°C if the saturation vapour pressure of water is 23 mm Hg at that temperature?

  1. A.737 mm Hg
  2. B.763 mm Hg
  3. C.777 mm Hg
  4. D.783 mm Hg.
Show the answer and explanation

Answer: A (737 mm Hg)

Explanation

By Dalton's law the total pressure is the sum of the partial pressures: p(H2) = 760 − 23 = 737 mm Hg.