Percent composition
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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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Percent composition

Percent Composition

Calculating percent composition with pigments.


Molar mass

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


Vermilion hgs a red pigment

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


Percent composition1

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


Paris green cu c 2 h 3 o 2 2 3cu aso 2 2

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


Paris green cu c 2 h 3 o 2 2 3cu aso 2 21

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


Paris green cu c 2 h 3 o 2 2 3cu aso 2 22

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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