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JAMB Chemistry 1993 Question 6

Question 6

Gas Laws

A gaseous mixture of 80.0 g of oxygen and 56.0 g of nitrogen has a total pressure of 1.8 atm. The partial pressure of oxygen in the mixture is [O = 16, N = 14]

  1. A.0.8 atm
  2. B.1.0 atm
  3. C.1.2 atm
  4. D.1.4 atm
Show the answer and explanation

Answer: B (1.0 atm)

Explanation

Moles of O2 = 80/32 = 2.5 and moles of N2 = 56/28 = 2.0. Partial pressure of O2 = (2.5/4.5) × 1.8 = 1.0 atm.