- Empirical Formulas are the simplest formula of a compound
- Show only the simplest ratios, not the actual atom
- Example: the empirical formula for Chlorine gas is Cl
- Molecular formulas give the actual number of atoms
- To determine the empirical formula, we need to know the ratio of each atom
- To determine the ratio, fill in the table below:
ex, A sample of an unknown compound is found to contain 8.4 g of C, 2.1 g of H, and 5.6 g of O. Determine the empirical formula.
- The simplest ratio may be decimals. For certain decimals, you need to multiply everything by a common number.
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