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JAMB Chemistry 1979 Question 36

Question 36

Gas Laws

The vapour density of a gas may be defined as

  1. A.the mass of a unit volume of the gas compared to an equal volume of water vapour
  2. B.the mass of a unit volume of the gas compared to an equal volume of hydrogen
  3. C.the mass of a unit volume of the gas compared to an equal volume of oxygen
  4. D.the mass of a unit volume of the gas minus the vapour pressure of water
  5. E.two times the relative molecular mass of the gas.
Show the answer and explanation

Answer: B (the mass of a unit volume of the gas compared to an equal volume of hydrogen)

Explanation

Vapour density compares the mass of a volume of gas with the mass of the same volume of hydrogen under the same conditions; it equals half the relative molecular mass.