# It helps to know the % of the components in a shirt because they affect how warm it is, whether it will need to be ironed, and how it should be cleaned.

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## It helps to know the % of the components in a shirt because they affect how warm it is, whether it will need to be ironed, and how it should be cleaned.

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It helps to know the % of the components in a shirt because they affect how warm it is, whether it will need to be ironed, and how it should be cleaned. You will learn how the % of the elements in a compound are important in chemistry. Chemical Composition Unit 7

% Composition % by mass = mass of element x 100 total mass 194.20 g/mol 294.20 g/mol

% by mass = mass of element x 100 total mass % O = 5.40 g O x 100 = 13.60 g 39.7% O % Mg = 8.20 g Mg x 100 = 13.60 g 60.3% Mg

% by mass = mass of element x 100 total mass % C = 36.03 g C x 100 = 44.11 g 81.68% C % H = 8.08 g H x 100 = 44.11 g 18.3% H C 3 H 8 : 3 (12.01) + 8 (1.01) = 36.03 + 8.08 = 44.11 g/mol

NH3: %N = 14.01 g N x 100 = 17.04 g 82.22% N NH4NO3: %N = 28.02 g N x 100 = 80.06 g 35.00% N 17.04 g/mol 80.06 g/mol

1. The percent composition of a compound is found by dividing the mass of each element by the ________. moles of each element percent of each element total mass of the compound total number of elements Quick Quiz!

Calculate the percent by mass of carbon in cadaverine, C5H14N 2, a stinky compound present in rotting meat. 67.4% C 58.8% C 51.7% C 68.2% C Quick Quiz.