PERCENT COMPOSITION
&
PERCENT YIELD
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Determining Percent Composition of Compounds, Schemes and Mind Maps of Chemistry
A step-by-step process for calculating the percent composition of elements in a compound using their molar masses and the mass of one mole of the compound. The example problems given are for Potassium Permanganate (KMnO4) and Sodium Carbonate (Na2CO3).
Typology: Schemes and Mind Maps
2021/2022
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PERCENT YIELD
Percent Composition – the percentage
by mass of each element in a compound
Percent =
_______ Part
Whole
x 100%
Mass of element in 1 mol
Percent composition of a compound or = molecule
____________________
Mass of 1 mol
x 100%
Example: What is the percent composition of Potassium Permanganate (KMnO 4 )? = 158 g % K Molar Mass of KMnO 4 39.1 g K 158 g x 100 = 24.7 % % Mn 54.9 g Mn 158 g x 100 =
% O
64.0 g O 158 g x 100 = 40.5 %
Determine the percentage composition of sodium carbonate (Na 2
CO
3
Molar Mass Percent Composition % Na = 46.0 g 106 g x 100% = 43.4 % % C = 12.0 g 106 g x 100% = 11.3 % % O = 48.0 g 106 g x 100% = 45.3 % Na = 2(23.00) = 46. C = 1(12.01) = 12. O = 3(16.00) = 48. MM= 106 g