# How can empirical and molecular formulas be the same?

May 2, 2016

From the above, "Molecular formula"=("Empirical formula")xxn.
Of course, the multiple, $n$, may be ONE. Non-molecular compounds, typically ionic compounds, have common empirical and molecular formulae (of course ionic species are non-molecular).
There are even some molecular species whose empirical formulae would be the same as the molecular formulae. The ones I can think off hand are $C {H}_{4}$, $N O$, $N {O}_{2}$, ${N}_{2} O$, ${N}_{2} {O}_{5}$, $C {O}_{2}$, $C O$, and ${H}_{2} O$. There are possibly lots of other examples.