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JAMB Chemistry 2012 Question 44

Question 44

Introduction to Organic Chemistry

A compound contains 40.0% C, 6.7% H 53.3% O. If the molecular mass of the compound is 180, its molecular formula is [C = 12, H = 1, O = 16]

  1. A.CH2O
  2. B.C3H6O3
  3. C.C6H6O3
  4. D.C6H12O6
Show the answer and explanation

Answer: D (C6H12O6)

Explanation

C : H : O = 40/12 : 6.7/1 : 53.3/16 = 3.33 : 6.7 : 3.33 = 1 : 2 : 1, so CH2O (30). 180/30 = 6, giving C6H12O6.