Percentage Composition. Percent Part Whole X 100% Mass of element Mass of compound X 100% X 100%...
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Transcript of Percentage Composition. Percent Part Whole X 100% Mass of element Mass of compound X 100% X 100%...
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Percentage CompositionPercentage Composition
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PercentPercent
PartPart
WholeWholeX 100%X 100%
Mass of elementMass of elementMass of compoundMass of compound
X 100%X 100%
Percent by mass =Percent by mass =
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Percent CompositionPercent Composition
Can be determined by analysis.Can be determined by analysis.
Or, if you know the formula:Or, if you know the formula:
Just assume you have 1 moleJust assume you have 1 mole
Divide the mass of each element by Divide the mass of each element by the formula mass of the compoundthe formula mass of the compound
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Percent Composition of HPercent Composition of H22OO
2 X H = 2 X 1.0 = 2.0 2 X H = 2 X 1.0 = 2.0 1 X O = 1 X 16.0 = 16.01 X O = 1 X 16.0 = 16.0
Molar mass = 2.0 + 16.0 = 18.0Molar mass = 2.0 + 16.0 = 18.0
%H = (2.0/18.0) X 100% = 11.2%%H = (2.0/18.0) X 100% = 11.2%
%O = (16.0/18.0) X 100% = 88.8%%O = (16.0/18.0) X 100% = 88.8%
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Percent Composition of CPercent Composition of C66HH1212OO66
6 X C = 6 X 12.0 = 72.06 X C = 6 X 12.0 = 72.0
12 X H = 12 X 1.0 = 12.012 X H = 12 X 1.0 = 12.0
6 X O = 6 X 16.0 = 96.06 X O = 6 X 16.0 = 96.0
Molar mass = 180.0 gramsMolar mass = 180.0 grams
% C =% C =
% H = % H =
% O =% O =
(72.0/180.0) X 100% = 40.0%(72.0/180.0) X 100% = 40.0%
(12.0/180.0) X 100% = 6.67%(12.0/180.0) X 100% = 6.67%
(96.0/180.0) X 100% = 53.3%(96.0/180.0) X 100% = 53.3%
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Percent Composition of NaClPercent Composition of NaCl
Molar mass of NaCl = 58.5 g/moleMolar mass of NaCl = 58.5 g/mole
% Na = 23.0/58.5 X 100% = 39.3%% Na = 23.0/58.5 X 100% = 39.3%
% Cl = 35.5/58.5 X 100% = 60.7%% Cl = 35.5/58.5 X 100% = 60.7%
(Or, 100% - 39.3% = 60.7%)(Or, 100% - 39.3% = 60.7%)
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Percentage CompositionPercentage Composition
They won’t remind you that you They won’t remind you that you have to calculate the formula have to calculate the formula mass!mass!