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JAMB Chemistry 1989 Question 5

Question 5

Gas Laws

The minimum volume of oxygen required for the complete combustion of a mixture of 10 cm3 of CO and 15 cm3 of H2 is

  1. A.25.0 cm3
  2. B.12.5 cm3
  3. C.10.0 cm3
  4. D.5.0 cm3.
Show the answer and explanation

Answer: B (12.5 cm3)

Explanation

2CO + O2 → 2CO2, so 10 cm3 CO needs 5 cm3 O2. 2H2 + O2 → 2H2O, so 15 cm3 H2 needs 7.5 cm3. Total = 12.5 cm3.