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Molecular Mass

What is the empirical and molecular formulas in a compound that is 23 nitrogen and 77 oxygen and has a molecular mass of 124 gmole?

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October 02, 2007 9:08PM

The question is missing something; I must assume that the compound is 23% N by mass and 77% O by mass. Starting with NO3 as an initial guess turns up 22.6% N, 77.4% O, which agrees with the above if we round off to two significant figures. It has a molar mass of 62, precisely half the stated molecular mass. One could presume a dimer of NO3, i.e., N2O6, which is hardly a common species but does appear in the literature.