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Molecular Formula

Molecular Formula. Molecular Formula. Is always a whole number multiple of the empirical formula Ex: A 100.0 g sample of TNT is composed of 31.7 g carbon, 2.60 g hydrogen, 18.5 g nitrogen, and 42.3 g oxygen. (Its molar mass is 227 g/mol). Molecular Formula.

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Molecular Formula

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  1. Molecular Formula

  2. Molecular Formula • Is always a whole number multiple of the empirical formula • Ex: A 100.0 g sample of TNT is composed of 31.7 g carbon, 2.60 g hydrogen, 18.5 g nitrogen, and 42.3 g oxygen. (Its molar mass is 227 g/mol)

  3. Molecular Formula • Step 1: Determine the empirical formula 1 mol 12 g C 2.64 mol C _________ 2 31.7 g C 1 = = x 1.32 mol 2.60 g H 1 1 mol 1 g H 2.60 mol H x _________ = = 2 1.32 mol C2H2NO2 18.5 g N 1 1 mol 14 g N 1.32 mol N _________ x = = 1 1.32 mol 2.64 mol O 42.3 g O 1 1 mol 16 g O ________ = x = 2 1.32 mol

  4. Molecular Formula • Step 2: Determine the empirical formula molar mass • C2H2NO2 = 72 g/mol

  5. Molecular Formula • Step 3: Divide the molar mass by the empirical formula molar mass 227 g/mol 72 g/mol = 3.15 or 3

  6. Molecular Formula • Step 4: Multiply the empirical formula by the ratio of the molar mass to the empirical formula • 3 (C2H2NO2) = C6H6N3O6

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