5_Lesson5.pdf - Molecular Composition Lesson 5 Empirical...

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Molecular Composition Lesson 5 Empirical formula Percent composition Combustion Analysis Mary J. Bojan Chem 110 1 MJ Bojan Chem 110 2 Atoms (or ions) combine (bond) to form molecules (or compounds) . Each molecule has a chemical formula. The chemical formula indicates which atoms are found in the molecule, and in what proportion they are found.
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MJ Bojan Chem 110 3 EMPIRICAL FORMULA: Chemical formula with the smallest integer subscripts for a given composition. CHEMICAL FORMULA: gives the TOTAL number of elements in a molecule or formula unit. MJ Bojan Chem 110 4 To determine the empirical formula : we can do chemical analysis. To get the molecular formula , we need additional information: Molecular weight. MOLAR MASS or FORMULA WEIGHT sum of atomic weights The connection between experimental property (mass) and moles: C 8 H 18 8 C 12.01 96.08 18H 1.008 18.14 Mass Spectroscopy is used to get atomic and molecular weights. For more on Mass Spectroscopy see: Lesson 01.1 Figure: 01-1-4
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MJ Bojan Chem 110 5 What does a formula tell you?
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