Empirical formula

• Empirical formula shows the simplest whole number ratio of the atoms of each element in a compound
• Often compounds are already in the empirical formula like H²0 and CH⁴. However in other chemical formula it acn be simplified using their highest common factor.
• A balanced chemical equation shows the formulae and the numbers of units for all the substances in a reaction. The total of atoms in each element must be the same of each side of the arrow. For example:

  C+O²➡️CO²