u6lectout

u6lectout - Unit 6: The Mathematics of Chemical Formulas #...

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Unit 6: The Mathematics of Chemical Formulas Name: ____________________ # of H 2 O molecules # of H atoms # of O atoms 1 2 3 100 6.02 x 10 23 molar mass : PbO 2 HNO 3 ammonium phosphate percentage composition : the mass % of each element in a compound Find % composition. PbO 2 (NH 4 ) 3 PO 4 zinc acetate Finding an Empirical Formula from Experimental Data 1. Find # of g of each element. 2. Convert each g to mol. 1
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3. Divide each “# of mol” by the smallest “# of mol.” 4. Use ratio to find formula. A compound is 45.5% yttrium and 54.5% chlorine. Find its empirical formula. A ruthenium/sulfur compound is 67.7% Ru. Find its empirical formula. A 17.40 g sample of a technetium/oxygen compound contains 11.07 g of Tc. Find the empirical formula. A compound contains 4.63 g lead, 1.25 g nitrogen, and 2.87 g oxygen. Name the compound. To find molecular formula… A. Find empirical formula. B. Find molar mass of empirical formula.
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This note was uploaded on 11/09/2011 for the course CHEM 110 taught by Professor Sullivan during the Fall '10 term at BYU.

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u6lectout - Unit 6: The Mathematics of Chemical Formulas #...

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