One Hydrogen molecule is expressed as H2. It means, there are two Hydrogen atoms in that molecules. 

Again, one molecule of water is expressed as H2O, meaning, it contains two Hydrogen atoms and an Oxygen atom. The following table shows formulas of some common molecules:

Name of Molecule & Formula

Nitrogen = N2

Ammonia = NH3

Chlorine = Cl2

Sulfuric Acid = H2SO4

Hydrochloric Acid = HCl

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