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JAMB Chemistry 2008 Question 43

Question 43

Chemical Formulae and Equations

A hydrocarbon X with a molar mass of 26 consists of 92.3% carbon. What is its molecular formula?

  1. A.C2H2
  2. B.C3H3
  3. C.C4H4
  4. D.C5H5.
Show the answer and explanation

Answer: A (C2H2)

Explanation

C : H = 92.3/12 : 7.7/1 = 7.7 : 7.7 = 1 : 1, so the empirical formula is CH (13). 26 ÷ 13 = 2, giving C2H2.