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AP EAMCET2015ChemistrySome Basic Concepts of Chemistry

A carbon compound contains 12.8 % of carbon, 2.1 % of hydrogen and 85.1 % of bromine. The molecular weight of the compound is 187.9. Calculate the molecular formula of the compound. (Atomic weight: H =1.008, C =12.0, Br =79.9 )

Options

  1. ACH₃Br
  2. BCH₂Br₂I
  3. CC₂H₄Br₂
  4. DC₂H₃Br₃

Correct answer

C. C₂H₄Br₂

Step-by-step solution

Empirical formula = CH ₂ Br Empirical formula mass =12+2+80=94 Factor, n= Molecular mass Empirical formula mass = 187.9 94 =2 Molecular formula = ( CH ₂ Br )₂= C ₂ H ₄ Br ₂

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