The molar mass of hexane is about 86 grams per mole. The molar mass of a compound can be determined from the atomic weight of each atom, available on the periodic table of elements. The chemical formula for hexane is written as C6H14.
The atomic weight of carbon is about 12 grams per mole. For the six carbon atoms contained in hexane, the total mass is 72 grams per mole. The atomic weight of each atom of hydrogen is about 1 gram per mole. The total mass of hydrogen in one molecule of hexane, which contains 14 atoms of hydrogen, is 14 grams per mole.