Question

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

Answer 1

C₆H₆

Step-by-step 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 =
`(78)/(13)` = 6

So;

(CH)₆ ;

Therefore:

C₆H₆