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Question

A compound containing 4.07% Hydrogen, 24.27% Carbon & 71.67% Chlorine. Molecular Mass is 98.96g. What are it's emperial formula & molecular formula ?

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Solution

Element

Percentage Ratio

Simple Ratio

Empirical Formula

Carbon

24.27/12 = 2.02

2.02/2.01 =1

CH2Cl

Hydrogen

4.07/1 = 4.07

4.07/2.01 =2

Chlorine

71.67/35.5 = 2.01

2.01/2.01 = 1

Empirical formula weight: CH2Cl = 12 + 1x2 + 35.5

= 49.5

Molecular formula ratio = 98.96/49.5 ≈ 2

Molecular formula = C2H4Cl2


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