The molar mass of citric acid, whose chemical formula is written as C6H8O7, is 192.12 grams per mole. The molar mass is calculated from the atomic weight of each atom comprising a single molecule of citric acid.
Each carbon atom has an atomic weight of about 12.0107 grams per mole, with a total weight of 72.06 grams per mole for the six atoms of carbon in citric acid. An individual hydrogen atom has an atomic weight of about 1.0078 gram per mole, for a total weight of 8.06 grams per mole for the eight hydrogen atoms. Each individual oxygen atom has an atomic weight of about 15.9994 grams per mole.The total weight for the seven oxygen atoms is 111.996 grams per mole. The rounded total of the sum atomic weight for all atoms is 192.12 grams per mole.