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JAMB Chemistry 2002 Question 48

Question 48

Gas Laws

A gas X diffuses twice as fast as gas Y under the same conditions. If the relative molecular mass of X is 28, calculate the relative molecular mass of Y.

  1. A.112
  2. B.120
  3. C.56
  4. D.14
Show the answer and explanation

Answer: A (112)

Explanation

Graham's law: rateX/rateY = √(MY/MX), so 2 = √(MY/28), giving MY = 4 × 28 = 112.