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A molecular formula is the actual number of atoms in the molecule, whereas the other type, empirical formula is the molecular formula in its simplest ratio.
For example, if you have hydrogen peroxide, which is H2O2.
H2O2 is its molecular formula, because one molecule of hydrogen peroxide has 2 hydrogen and 2 oxygen atoms. However, the ratio 2:2 can be simplified to 1:1. Thus, its empirical formula is simply HO.
So now see which ones MUST be molecular formulas (in other words, can't be empirical formulas).
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