Work Step by Step
Each percentage represents the number of grams of an element per 100.0 grams of that compound. Convert these masses to moles using molar masses. Determine the number of moles of each element relative to the other elements. Divide all quantities by the smallest amount of moles. Compute the molar mass of the empirical formula. A molecular formula is always a whole number multiple of the empirical formula. Divide the molecular molar mass by the empirical molar mass to get this whole number.