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JAMB Chemistry 1997 Question 5

Question 5

Gas Laws

An element, X, forms a volatile hydride XH3 with a vapour density of 17.0. The relative atomic mass of X is [H = 1]

  1. A.34.0
  2. B.31.0
  3. C.20.0
  4. D.14.0
Show the answer and explanation

Answer: B (31.0)

Explanation

Relative molecular mass = 2 × vapour density = 34. Taking away 3 for the three hydrogens leaves 31 for X.