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Measurements and Calculations in chemistry - Molecular formulas

Learn about molecular formulas in chemistry, how to identify the number of atoms in a molecule, and solve exercise problems to determine molecular formulas for compounds. Examples and answers provided.

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Measurements and Calculations in chemistry - Molecular formulas

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  1. Measurements and Calculations in chemistry- Molecular formulas Dr. Chin Chu Chemistry River Dell High School

  2. Definition: Molecular Formula - of a chemical compound identifies the number of each type of atom in a molecule.

  3. background

  4. Examples

  5. The process

  6. Molecular formula Examples • A compound was composed of carbon (85.7% by mass) and hydrogen (14.3% by mass) with a molecular weight (molar mass) of 64.0 g/mol. What is the molecular formula for this compound?

  7. Molecular formula – exercise problems • A compound was analyzed to be composed of nitrogen and oxygen. Percent composition of each element is 30.4% (nitrogen) and 69.6% (oxygen). Molar mass of the compound was measured to be 92.0g/mol. What is the molecular formula for the compound? • What is the molecular formula for a compound consists of carbon(25.9% by mass) and hydrogen (74.1% by mass) and a molecular weight (molar mass) of 78.0g/mol.? • What is the molecular formula for a compound consists of carbon (32.7% by mass), hydrogen (2.0% by mass), and oxygen (65.3% by mass) with a molar mass (molecular weight) of 180.0 g/mol.?

  8. Empirical formula – Answers • [N2O4] • [C6H6] • [C6H12O6]

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