The chemical formula for ethanoic acid is C2H4O2, although it can also be written as CH3COOH or CH3CO2H. Ethanoic acid is more commonly called acetic acid.
The chemical formula indicates that the acid is composed of two atoms of carbon, four atoms of hydrogen and two atoms of oxygen. It is a weak acid that is part of a group of acids known as carboxylic acid. Ethanoic acid is a common component of vinegar. It is most often used in the production of various chemical compounds. Ethanoic acid has a molar mass of 60.05 grams per mole and a density of 1.04 grams per cubic centimeter.