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JAMB Chemistry 1987 Question 6

Question 6

Gas Laws

Which of the following substances has the lowest vapour density? [O = 16, Cl = 35.5, H = 1, C = 12]

  1. A.Ethanoic acid
  2. B.Propanol
  3. C.Dichloromethane
  4. D.Ethanal
Show the answer and explanation

Answer: D (Ethanal)

Explanation

Vapour density is half the relative molecular mass. Ethanal CH3CHO (44) is lighter than ethanoic acid (60), propanol (60) and dichloromethane (85).