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Which of the following formulas -- NO, N2O, NO2, N2O, N2O4, AND N205 -- represent the empirical and molecular formulas of the same compound?

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    For a formula to be both empirical and molecular, it must not be a multiple or sub-multiple of one of the others.
    For example, NO as the atoms in a 1:1 ratio. There is no other formula listed with atoms in a 1:1 ratio; therefore, NO must be one of those that is empirical AND molecular. NO2 is not BECAUSE N2O4 is listed. So NO2 is the empirical formula and N2O4 is the molecular formula.(That also makes N2O4 not one). Etc.

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