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JAMB Chemistry 2001 Question 7

Question 7

Gas Laws

An oxide XO2 has a vapour density of 32. What is the atomic mass of X?

  1. A.32
  2. B.20
  3. C.14
  4. D.12
Show the answer and explanation

Answer: A (32)

Explanation

Relative molecular mass = 2 × vapour density = 64. So X + 2(16) = 64 and X = 32.