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Unformatted text preview: Have to “do experiment” to get actual yield Empirical Formula Ratio of number of each type of atom Related to MOLECULAR FORMULA by whole number multiple Calculate from relative masses of elements For each element in substance: (a) convert to moles (b) convert moles to “nice” numbers by dividing by smallest number (c) if necessary, multiply ALL by 2, 3 etc to clear fractions If given PERCENT of each element, use percent as grams If not given one element, subtract other masses from total sum For combustion of C, H compounds or C, H, O compounds Sometimes given g of CO 2 and H 2 O, Convert to: g of C by multiplying CO 2 mass by (12 / 44) g of H by multiplying H 2 O mass by (2 / 18) Percent by Mass From formula: %mass of element = mass of element in 1 mole x 100 Molar mass of compound Dilutions Diluting a solution: Old molarity x old volume = new molarity x new volume...
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 Spring '08
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 Chemistry, Atom, Molarity, Mole, Stoichiometry, Moles, Molecular formula

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