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The number of oxygen atoms can vary depending on the context. In a single oxygen molecule (O2), there are two oxygen atoms bonded together. In a molecule of ozone (O3), there are three oxygen atoms. In a water molecule (H2O), there is one oxygen atom.
There are two atoms of oxygen in an oxygen (O2) molecule.
There are 3 atoms in an oxygen molecule (O2).
The oxide Fe2O3 has 3 oxygen atoms in the molecule.
There are two oxygen atoms in an oxygen molecule (O2).
There are three oxygen atoms in the molecule HNO3.