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JAMB Chemistry 1986 Question 7

Question 7

Gas Laws

The relationship between the velocity (U) of gas molecules and their relative molecular mass (M) is shown by the equation

  1. A.u = (kM)½
  2. B.U = (kM)2
  3. C.U = k/m
  4. D.U = (k/m)½
Show the answer and explanation

Answer: D (U = (k/m)½)

Explanation

Graham's law says the speed of gas molecules is inversely proportional to the square root of the molar mass, so U = √(k/M) = (k/M)½.