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JAMB Chemistry 1982 Question 30

Question 30

Gas Laws

100 cm3 of oxygen is made to react with 50 cm3 of hydrogen, and the whole reaction mixture was then passed through anhydrous calcium chloride. What is the volume of gas left?

  1. A.5 cm3
  2. B.25 cm3
  3. C.50 cm3
  4. D.75 cm3
  5. E.100 cm3.
Show the answer and explanation

Answer: D (75 cm3)

Explanation

50 cm3 H2 needs only 25 cm3 O2; the water formed is absorbed by the calcium chloride, leaving 100 − 25 = 75 cm3 of oxygen.