# Calculations of Empirical Formulae and Molecular Formulae

### Empirical Formula :

Empirical formula of a substance gives the simplest whole number ratio between the atoms of the various elements present in one molecule of the substance. For example, empirical formula of glucose is CH2O, i.e. for each carbon atom, there are two H-atoms and one oxygen atom. Its molecular formula is C6H12O6.

### Molecular Formula :

Molecular formula of a substance gives the actual number of atoms present in one molecule of the substance.

Molecular formula = n × Empirical formula
where, n is a simple integer 1, 2, 3,......etc.

\tt n =\frac{Molecular \ mass \ of \ the \ compound}{Empirical \ formula \ mass \ of \ the \ compound}

### View the Topic in this Video from 2:18 to 13:20

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1. Molecular formula = nx

where, n = \tt \frac{molecular \ mass}{empirical \ formula \ mass}

x = empirical formula