Percentage Composition

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Presentation transcript:

Percentage Composition The idea of percentage composition can be used to help us calculate empirical formulas. This is the percentage by mass of a particular element in a chemical compound. Percentage is based on (part ÷ whole) x 100 . Next >

Percentage Composition To calculate the percentage composition: % of element in compound = mass of element in sample of compound × 100 mass of sample of the whole compound (molar mass) Next >

Percentage Composition Calculate the percentage composition of methane (CH4): First calculate molar mass for the compound. Determine how much mass each element contributes to the compound. mass of element in the compound × 100 molar mass of compound For hydrogen: % of element in compound = mass of hydrogen present in CH4 × 100 molar mass of CH4 = 4 × 1.01 × 100 = 25.2 % 16.05 Next >

Percentage Composition For carbon: % of element in compound = mass of carbon present in CH4 × 100 molar mass of CH4 = 12.01 × 100 = 74.83% 16.05 Check: 25.2% + 74.83% ≈ 100% Next >

Here is the answer! Pb: 74.51% Cl: 25.49% PRACTICE QUESTION Find the percentage compositions of PbCl2 given that the relative atomic masses of Pb and Cl are 207.2 and 35.45 respectively. Here is the answer! Pb: 74.51% Cl: 25.49% NOW SHOW YOUR WORK TO GET THOSE ANSWERS! Next >