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  4. Empirical formula of a hydrocarbon containing 80% carbon and 20% hydrogen is:

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Q. Empirical formula of a hydrocarbon containing 80% carbon and 20% hydrogen is:

JIPMERJIPMER 2002Organic Chemistry – Some Basic Principles and Techniques

Solution:

Element
%
Atomic weight
Percentage at weight
Simple ratio
C
80
12
$ \frac{80}{12}=6.67 $
$ \frac{6.67}{6.67}=1 $
H
20
1
$ \frac{20}{1}=20.0 $
$ \frac{20.0}{6.67}=3 $
Hence, empirical formula of hydrocarbon $ =C{{H}_{3}} $ .