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JAMB Chemistry 1997 Question 12

Question 12

Atomic Structure

Oxygen is a mixture of two isotopes 168O and 188O with relative abundances of 90% and 10% respectively. The relative atomic mass of oxygen is

  1. A.16.0
  2. B.16.2
  3. C.17.0
  4. D.18.0
Show the answer and explanation

Answer: B (16.2)

Explanation

Relative atomic mass = (90 × 16 + 10 × 18)/100 = (1440 + 180)/100 = 16.2.