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JAMB Chemistry 1985 Question 3

Question 3

Chemical Formulae and Equations

An organic compound contains 72% carbon, 12% hydrogen and 16% oxygen by mass. The empirical formula of the compound is (H = 1, C = 12, O = 16).

  1. A.C8H22O3
  2. B.C6H10O3
  3. C.C12H12O
  4. D.C6H12O
  5. E.C3H6O.
Show the answer and explanation

Answer: D (C6H12O)

Explanation

Moles: C 72/12 = 6, H 12/1 = 12, O 16/16 = 1. The simplest ratio is 6 : 12 : 1, so the empirical formula is C6H12O.