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Molecular and Empirical Formulas

Molecular and Empirical Formulas. H 2 O. H 2. CO 2. He. Ne. Ar. Molecular and Empirical Formulas. A molecule is a NEUTRAL substance in which the atoms are bonded to each other ONLY by covalent bonds.

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Molecular and Empirical Formulas

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  1. Molecular and Empirical Formulas

  2. H2O H2 CO2 He Ne Ar Molecular and Empirical Formulas • A molecule is a NEUTRAL substance in which the atoms are bonded to each other ONLY by covalent bonds. • ALL NOBLE GASES ARE MOLECULES (even though there is not covalent bonding present)!

  3. Molecular and Empirical Formulas Ex. (1) Circle (O) the formulas below that represent molecules and cross out (X) formulas that do not. Ca HNO2 HCl NaCl Ex. (2) Circle (O) the formulas below that represent molecules and cross out (X) formulas that do not. Rn H2S H2 H2O X X

  4. Molecular and Empirical Formulas Ex. (3) Circle (O) the formulas below that represent molecules and cross out (X) formulas that do not. SO32- HSO41- Xe MgO Ex. (4) Circle (O) the formulas below that represent molecules and cross out (X) formulas that do not. SO3 C6H12O6 He Pb(C2H3O2 )2 X X X X

  5. Molecular and Empirical Formulas • A molecular formula is a formula that indicates the smallest number of atoms that is present in the smallest particle of that substance. • A molecular formula is the formula of a molecule. • An empirical formula is a formula that shows the simplest ratio of the elements in a chemical compound.

  6. Molecular and Empirical Formulas Ex. (5) Complete the following chart. CH2O HCO2 NO2 C4H9 CH2O H2O HO NH2

  7. Molecular and Empirical Formulas Ex. (6) What is the molecular formula of form- aldehyde if its empirical formula is CH2O and its gram-molecular mass (GMM) is 30.g/mol? Empirical Molecular CH2O CH2O X 1 CH2O 30.g/mol 30.g/mol X 1

  8. Molecular and Empirical Formulas Ex. (7) What is the molecular formula of fructose if its empirical formula is CH2O and its mole mass is 180. g/mol? Empirical Molecular C6H12O6 CH2O X 6 C6H12O6 30.g/mol 180.g/mol X 6

  9. Molecular and Empirical Formulas Ex. (8) What is the molecular formula of acetic acid if its empirical formula is CH2O and its mole mass is 60. g/mol? Empirical Molecular C2H4O2 CH2O X 2 C2H4O2 30.g/mol 60.g/mol X 2

  10. Molecular and Empirical Formulas Ex. (9) What is the molecular formula of a compound if its empirical formula is CH2 and its mass is 70. g/mole? Empirical Molecular C5H10 CH2 X 5 C5H10 14g/mol 70.g/mol X 5

  11. Molecular and Empirical Formulas Ex.(10)Whatisthemolecularformulaofacompound if its empirical formula is NO2 and its gram- formula mass (GFM) is 138 g/mole? Empirical Molecular N3O6 NO2 X 3 N3O6 46g/mol 138g/mol X 3

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