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JAMB Chemistry 1987 Question 10

Question 10

Atomic Structure

An element Z, contained 90% of 168Z and 10% of 188Z. Its relative atomic mass is

  1. A.16.0
  2. B.16.2
  3. C.17.0
  4. D.17.8
Show the answer and explanation

Answer: B (16.2)

Explanation

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