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Molecular Formulas

Molecular Formulas. Find empirical formula Calculate molar mass of empirical formula Molar mass of compound / molar mass of empirical formula (we’ll call this the factor) Multiply subscripts by factor to get molecular formula. Molecular Formula.

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Molecular Formulas

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  1. Molecular Formulas • Find empirical formula • Calculate molar mass of empirical formula • Molar mass of compound / molar mass of empirical formula (we’ll call this the factor) • Multiply subscripts by factor to get molecular formula

  2. Molecular Formula • A compound is found to have an empirical formula of C2H3O2. The molar mass of the compound has 118.1 g/mol. What is the molecular formula? • Molar mass of C2H3O2 C2H3O2 = 2x12 + 3x1 + 2x16= 59 g/mol • Molar mass of compound / molar mass of empirical 118.1 / 59 = 2

  3. Molecular Formula • A compound was found to contain 49.98 g carbon and 10.47 g of hydrogen. The molar mass of the compound is 58.12g/mol. Determine the molecular formula • C= 49.98 / 12 = 4.165 / 4.165 = 1 x 2 = 2 • H= 10.47 / 1 = 10.47 / 4.165 = 2.5 x 2 = 5 • C2H5 = 2x12 + 5x1 = 29 • 58.12 /29 = 2 C2H5 x2 x2 C4H10

  4. Molecular Formula Practice I 1. Analysis of a chemical used in photographic developing fluid indicates a chemical composition of 65.45% C, 5.45% H, and 29.09% O. The molar mass is found to be 110 g/mol. Determine the molecular formula.

  5. Molecular Formula Practice I 2. A compound was found to contain 49.98 g carbon and 10.47 g hydrogen. The molar mass of the compound is 58.12 g/mol. Determine the molecular formula.

  6. Molecular Formula Practice I 3. A colorless liquid composed of 46.68% nitrogen and 53.32% oxygen has a molar mass of 60.01 g/mol. What is the molecular formula?

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