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JAMB Chemistry 2005 Question 20

Question 20

Air

25cm3 of a mixture of noble gases was obtained from air after the removal of other constituents. What was the original volume of air?

  1. A.2 500 cm3
  2. B.1 250 cm3
  3. C.125 cm3
  4. D.80 cm3
Show the answer and explanation

Answer: A (2 500 cm3)

Explanation

Noble gases make up about 1% of air, so the air volume = 25 × 100 = 2500 cm3.