Percent Composition and Chemical Formulas

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© 2014 Pearson Education, Inc. Chapter 7 Lecture Basic Chemistry Fourth Edition Chapter 7 Chemical Quantities 7.4 Mass Percent Composition and Empirical.

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Presentation transcript:

Percent Composition and Chemical Formulas Chapter 3.3

Percent Composition It is sometimes useful to know a compound’s composition in terms of the masses of its elements. This is known as percent mass. % mass =

Percent Composition – Example Calculate the percent composition of titanium dioxide (TiO2)

Percent Composition – Example Calculate the percent composition of ammonium chloride (NH4Cl)

Percent Composition Extension – Example Calculate the mass of hydrogen in 15.2 g ammonium chloride.

Empirical Formulas Empirical formulas are the lowest whole-number ratio of the atoms in a compound

Molecular Formulas A molecular formula is a multiple of the empirical formula Empirical Formula - CH2O Molecular Formula – C2H4O2 (Acetic Acid) Molecular Formula – C3H6O3 (Lactic Acid) Molecular Formula – C4H8O4 (1,4-dioxane-2,3-diol)

HW #39 Read Pages 60-67 Problems 62, 63, 65, 69, 73, 78