The empirical formula of a hydrocarbon (compound that contains only C and H is found to be CH. laboratory procedures have found that the molar mass of the compound is 78 g/mol. What is the molecular formula of this compound

C₆H₆

Explanation:

Molar mass of the compound is 78g/mol

Unknown:

Molecular formula of the compound  = ?

Solution:

The empirical formula of the compound is CH.

Empirical formula is the simplest formula of a compound.

To solve this problem:

 Find the molar mass of CH;

       Molar mass = 12 + 1  = 13g/mol

Multiplication index  =    = 6

So;

              (CH)₆  ;

 Therefore:

               C₆H₆

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