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Unit F Tutorial 2: Chemical Formulas and Formula Mass. Chem 23 Online University of Vermont Summer 2002. Chemical Compounds. Identified by a Formula : Chemical Formula – gives the actual numbers and types of atoms in molecule or compound
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Unit F Tutorial 2:Chemical Formulas and Formula Mass Chem 23 Online University of Vermont Summer 2002
Chemical Compounds • Identified by a Formula: Chemical Formula– gives the actual numbers and types of atoms in molecule or compound Empirical Formula– gives the relative numbers of atoms in molecule (smallest whole-number ratio)
Formula Mass • Knowing the Chemical Formula, we can calculate the Formula Mass Example:Sodium Hydroxide Chemical Formula: NaOH Formula Mass: 22.9898 15.9994 + 1.00797 39.9972 amu • Break formula down into atoms: • 1 Na atom = 22.9898 amu • 1 O atom = 15.9994 amu • 1 H atom = 1.00797 amu