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JAMB Chemistry 2011 Question 43

Question 43

Introduction to Organic Chemistry

An organic compound has an empirical formula CH2O and vapour density of 45. What is its molecular formula? [C = 12, H = 1, O = 16]

  1. A.C3H7OH
  2. B.C2H5OH
  3. C.C3H6O3
  4. D.C2H4O2
Show the answer and explanation

Answer: C (C3H6O3)

Explanation

Molar mass = 2 × 45 = 90. CH2O = 30, so n = 3 and the formula is C3H6O3.