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Percent Composition

This guide covers the concept of percentage composition by mass of elements in compounds, with a detailed formula: % Element = (Mass of Element x 100) / Mass of Compound. It includes practical examples, such as finding the percentage composition of copper(I) sulfide, nitrogen in (NH4)2CO3, and barium nitrate hydrates. It also explores hydrates, showcasing how crystals can bind water molecules, exemplified by the formula Na2CO3·10H2O. Practice problems are provided for calculating water percentage in various compounds.

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Percent Composition

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  1. Percent Composition

  2. Percent by mass of a particular element in a compound % Element = Mass of Element x 100 Mass of Compound

  3. Example Find the percentage composition of copper (I) sulfide.

  4. Practice • Find the percent of nitrogen in (NH4)2CO3 • Find the percent composition of Ba(NO3)2

  5. Hydrates • Some salt crystals bind water molecules in their crystal structure – called hydrates • The formula below shows a hydrate with a ratio of 10 water molecules per one salt molecule Na2CO3 • 10 H2O

  6. Example • Find the percent of water in Na2CO3 • 10 H2O

  7. Practice • Find the percent of water in ZnSO4• 7H2O

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