Determining Chemical Formulas

In chemistry, chemical formulas are for compounds as are IDs for humans.

Molecular Formula

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The formula of a compound that states the actual number of each kind of atom found in one molecule of the compound is the molecular formula of that compound.

Empirical Formula

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The formula of a compound that expresses the smallest whole number ratio of the atoms present is the empirical formula of that compound.

 REMEMBER: IONIC FORMULAS ARE ALWAYS EMPIRICAL FORMULAS                            

From Molecular to Empirical Formula

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To transform a molecular formula to an empirical formula, one must remove the common factor whilst maintaining whole numbers.

 C6H12O6 -> CH2O The common ratio of 1:2:1 is maintained and reduced.
                         

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