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u6lectout

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

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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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2 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. C. Find n = mm molecular 2
mm empirical D. Multiply all parts of empirical formula by n.

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

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