Percent Composition, Empirical and Molecular Formulas ...

February 26, 2014

Percent Composition, Empirical and Molecular Formulas

Chemists create new compounds for industry, pharmaceutical, and home use Analytical chemist analyzes new compound to provide proof of composition and chemical formula.

Ex: Aspirin- C9H8O4

February 26, 2014

Percent Composition: the percent by mass of each element in a compound

mass of element x 100 = percent by mass

mass of compound

*If given mass of each element--just divide. Example: A compound was found to contain 49.98g C and 10.47g H. What is the percent composition?

February 26, 2014

Given the chemical formula, to find the percent composition... 1. Assume you have 1 mole of the compound 2. Find the mass of each element (molar mass x subscript) 3. Use formula for percent by mass

February 26, 2014

Example 1: Find the percent composition of H2O

February 26, 2014

Example 2: Find the percent composition of sodium hydrogen carbonate (NaHCO3, or baking soda)

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