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Unformatted text preview: Formula from Empirical Formula • Obtain the empirical formula. • Compute the mass corresponding to the empirical formula. • Calculate the ratio Molar mass Empirical formula mass • The integer from the previous step represents the number of empirical formula units in one molecule. When the empirical formula subscripts are multiplied by this integer, the molecular formula results. This procedure is summarized by the equation: . . molar mass Molecular formula = (empirical formula) x empirical formula mass XAMPLE 3.10 Determine the empirical and molecular formulas for a compound that gives the following percentages on analysis (in mass percents): 7l.65% Cl 24.27% C 4.07% H The molar massis known to be 98.96 g/mol. Solution Where are we going? • To find the empirical and molecular formulas for the given compound What do we know? ./ Percent of each element ./ Molar mass of the compound is 98.96 glmol...
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This note was uploaded on 12/13/2010 for the course CHEM 2301 taught by Professor Bill during the Spring '10 term at South Texas College.
 Spring '10
 bill
 Organic chemistry, Atom

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