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Percent Composition

Percent Composition. Calculating percent composition with pigments. Molar Mass. Number of grams in 1 mole is equal to the numerical value of the atomic mass 1 mole of C atoms = 12.01 g C 1 mole of Mg atoms = 24.31 g Mg 1 mole of Cu atoms = 63.55 g Cu.

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Percent Composition

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  1. Percent Composition Calculating percent composition with pigments.

  2. Molar Mass • Number of grams in 1 mole is equal to the numerical value of the atomic mass 1 mole of C atoms = 12.01 g C 1 mole of Mg atoms = 24.31 g Mg 1 mole of Cu atoms = 63.55 g Cu

  3. Vermilion HgS (a red pigment) 1 mol of Hg x 200.59 g Hg = 200.59 g Hg 1 mole S x 32.06 g S = 32.06 g S Molar Mass of vermilion = 232.65 g HgS 1 mol Hg 1 mol S

  4. Percent Composition What is the percent mercury in vermilion (HgS)? 200.59 g Hg= 0.8622 x 100 = 86.22% 86.22% Hg 232.65 g HgS

  5. Paris Green Cu(C2H3O2)2·3Cu(AsO2)2 Molar Mass of Paris Green = 4 mol Cu 4 mol C 6 mol H 16 mol O 6 mol As 1013.81 g Cu(C2H3O2)2·3Cu(AsO2)2

  6. Paris Green Cu(C2H3O2)2·3Cu(AsO2)2 What is the percent copper in Paris Green? 254.2 g Cu 1013.81 g Cu(C2H3O2)2·3Cu(AsO2)2 = 0.2507 x 100 = 25.07% Cu

  7. Paris Green Cu(C2H3O2)2·3Cu(AsO2)2 What is the percent copper in Paris Green? 449.52 g As 1013.81 g Cu(C2H3O2)2·3Cu(AsO2)2 = 0.4434 x 100 = 44.34% As

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