Mention the significances of molecular formulae.

Definition of Molecular Formula:

1. The chemical formula that represents the number of atoms of all the elements present in the molecular formula.

Significance of Molecular Formula:

1. It indicates the type of elements present in the molecule.
2. It indicates the number of atoms of each element in the molecule.

Example:

1. The molecular formula of water is $\mathbf{\left(}{\mathbf{H}}_{\mathbf{2}}\mathbf{O}\mathbf{\right)}$.
2. This shows that there are two hydrogen $\mathbf{\left(}\mathbf{H}\mathbf{\right)}$ atoms and one oxygen $\mathbf{\left(}\mathbf{O}\mathbf{\right)}$ atom in a molecule of water.