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JAMB Chemistry 2002 Question 50

Question 50

Gas Laws

If 0.75 mole of cyclopropane and 0.66 mole of oxygen are mixed in a vessel with a total pressure of 0.7 atmosphere, what is the partial pressure of oxygen in the mixture?

  1. A.0.44 atmosphere
  2. B.0.22 atmosphere
  3. C.0.55 atmosphere
  4. D.0.33 atmosphere
Show the answer and explanation

Answer: D (0.33 atmosphere)

Explanation

Mole fraction of oxygen = 0.66 ÷ (0.75 + 0.66) = 0.468. Partial pressure = 0.468 × 0.7 ≈ 0.33 atmosphere.