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JAMB Chemistry 2001 Question 10

Question 10

Atomic Structure

An element X with relative atomic mass 16.2 contains two isotopes 168X with relative abundance of 90% and m8X with relative abundance of 10%. The value of m is

  1. A.16
  2. B.18
  3. C.12
  4. D.14
Show the answer and explanation

Answer: B (18)

Explanation

16 × 0.90 + m × 0.10 = 16.2, so 14.4 + 0.1m = 16.2, giving 0.1m = 1.8 and m = 18.