When new compounds are created, they always will consist of mixtures of different ratios of elements. Empirical Formula: A formula of a compound consisting of a ratio of simple whole numbers rather than the actual composition. Molecular Formula: A formula of a compound based on exact molecular weight and composition. The Molecular formula is always in some whole number ratio, n, of its particular empirical formula.

Assume the percentage of the compounds given is per 100 grams (since percent composition is also per 100). If not obtained whole number, like previous example PO2.5 then multiply to make the decimal the lowest possible whole number. Divide the known molar mass by the empirical formula mass to obtain the whole ratio integer for the molecular formula. Multiply the ratio obtained from the previous step by your empirical formula subscripts to obtain your molecular formula.

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