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JAMB Chemistry 1986 Question 21

Question 21

Air

The approximate volume of air containing 10 cm3 of oxygen is

  1. A.20 cm3
  2. B.25 cm3
  3. C.50 cm3
  4. D.100 cm3.
Show the answer and explanation

Answer: C (50 cm3)

Explanation

Air is about one-fifth (20%) oxygen, so 10 cm3 of oxygen is found in about 5 × 10 = 50 cm3 of air.