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Percent Composition

Learn how to find the percent composition of elements in a compound by calculating their masses and converting them to percentages. This skill is crucial for determining chemical formulas. Step-by-step instructions and sample problems provided.

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Percent Composition

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  1. Percent Composition

  2. Purpose: • We find percent composition using mass. • It will show us what % of the molecule is made up of its individual elements. • This will become very important when we learn how to find formulas in the near future.

  3. Steps for Percent Composition • Find the Molar Mass (if applicable). • Divide each elements’ mass by the total compound mass. • Multiply each by 100 to get a percent.

  4. Sample Problem #1 An unknown compound has a mass of 370.0 g. Upon analysis, chemists find that the sample contains 150.0 g of carbon, 180.0 g of oxygen and 40.0 g of hydrogen. What is the percent composition of each element in the compound? C: 150.0 g / 370.0 g =.4054 x 100 = 40.54 % O: 180.0 g / 370.0 g = .4865 x 100 = 48.65 % H: 40.0 g / 370.0 g = .108 x 100 = 10.8 %

  5. Sample Problem #2 • Calculate the percent composition of each element in the following compound: Silver Nitrate AgNO3 Total mass= 170g Ag-108/ 170=.4248 x 100 = 63.53% N- 14/ 170=.05517 x 100 = 8.24% O- 48/ 170= .50409 x 100 = 28.23% ____________ 100%

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