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JAMB Chemistry 2014 Question 4

Question 4

Gas Laws

A gas X diffuses twice as fast as gas Y. If the relative molecular mass of X is 32, calculate the relative molecular mass of Y.

  1. A.128
  2. B.8
  3. C.16
  4. D.64
Show the answer and explanation

Answer: A (128)

Explanation

Graham's law: rate X/rate Y = √(MY/MX). So 2 = √(MY/32), giving MY = 4 × 32 = 128.