Problem: Dichloroethane, a compound that is often used for dry cleaning, contains carbon, hydrogen, and chlorine. It has a molar mass of 99 g/mol. Analysis of a sample shows that it contains 24.3% carbon and 4.1% hydrogen. What is its molecular formula?

FREE Expert Solution

Given the mass percent of:

  • C = 24.3 % C
  • H = 4.1 % H

100%=%C+%H+%Cl100%=24.3%+4.1%+%Cl%Cl=100%-24.3%-4.1%

 % Cl = 71.6%



Assuming we have 100 g of the compound:

  • 24.3 g C 
  • 4.1 g H
  • 71.6 g Cl


The atomic masses are 12.01 g/mol C, 1.01 g/mol H, 35.45 g/mol Cl.


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Problem Details

Dichloroethane, a compound that is often used for dry cleaning, contains carbon, hydrogen, and chlorine. It has a molar mass of 99 g/mol. Analysis of a sample shows that it contains 24.3% carbon and 4.1% hydrogen. What is its molecular formula?

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