The molecular weight of HCl, or hydrochloric acid, is 36.46 grams per mole. To find its molecular weight, add the molecular weight of one molecule of hydrogen to the molecular weight of one mole of chlorine.
Hydrochloric acid is a colorless gas that is an important chemical compound in technology and industry. In its aqueous form, the gas is condensed into a liquid and has the same chemical formula. Both the liquid and gas forms of HCl consist of a hydrogen atom and a chlorine atom covalently bonded together via a single bond. The compound is polar due to its partial negative charge, and it is soluble in water and all polar solvents.