Common
Empirical formula
Simplest whole number ratio of atoms present in a compound
Empirical formula
In chemistry, the empirical formula of a chemical compound is the simplest whole number ratio of atoms present in a compound. For example, sulfur monoxide and disulfur dioxide, both compounds of sulfur and oxygen, both have the empirical formula SO. However, their molecular formulas, which express the number of atoms in each molecule of a chemical compound, are SO and S2O2, respectively. An empirical formula makes no mention of the arrangement or number of atoms. It is standard for many ionic compounds, like calcium chloride (CaCl2), and for macromolecules, such as silicon dioxide (SiO2). The molecular formula, on the other hand, shows the number of each type of atom in a molecule. The structural formula shows the arrangement of the molecule. It is also possible for different types of compounds to have equal empirical formulas. In the early days of chemistry, information regarding the composition of compounds came from elemental analysis, which gives information about the relative amounts...
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