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To understand the meaning of empirical formula To learn to calculate empirical formulas

Objectives. To understand the meaning of empirical formula To learn to calculate empirical formulas To learn to calculate the molecular formula of a compound. What is the Formula?. mass spec. If I analyze a compound by mass as 7.7% Hydrogen and 92.3 % Carbon what is its formula?

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To understand the meaning of empirical formula To learn to calculate empirical formulas

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  1. Objectives • To understand the meaning of empirical formula • To learn to calculate empirical formulas • To learn to calculate the molecular formula of a compound

  2. What is the Formula? mass spec • If I analyze a compound by mass as 7.7% Hydrogen and 92.3 % Carbon what is its formula? • If I have 100g of the compound how many grams do I have of each element? • How many moles of each element do I have? • What is the simple number ratio between the two numbers of moles? • What is the formula? • Is this the only possible formula?

  3. A. Empirical Formulas • The empirical formula of a compound is the simplest whole number ratio of the atoms present in the compound. • What is the empirical formula of the following compounds? • Sodium Peroxide Na2O2 • Terephthalic acid C8H6O4 • Phenobarbital C12H12N2O3 • 1,4-dichloro-2-butene C4H6Cl2

  4. B. Calculation of Empirical Formulas

  5. C. Calculation of Molecular Formulas • The molecular formula is the exact formula of the molecules present in a substance. • The molecular formula is always an integer multiple of the empirical formula. Molecular formula = (empirical formula)n where n is a whole number Empirical Formula: CH Molar Mass = 78 Molecular Formula?

  6. Formula SummaryFor the sugar glucose

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