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Unformatted text preview: Section 11.4 Mass of Element. Mass of Compound X 100 = Percent by mass Percent Composition : The percent by mass of any element in a compound can be found by dividing the mass of the element by the mass of the compound and then you multiply by 100. Jacob Zipperstein Empirical Formula : (compound) the formula with the smallest whole number mole ratio of the elements If they do not come out to be whole numbers, you must make them whole. Simply multiply the fraction to make it a whole number. Molecular Formula : specifies the actual number of atoms of each element in one molecule or formula unit of the substance Must find Empirical Formula to find Molecular Formula Molecular Formula = (Empirical Formula) n Section 11.5 Anhydrous means with out any water remaining Hydrate a compound that has a specific number of water molecules bound to its atoms...
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 Spring '07
 Thompson
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