The molar mass of hydrogen is 1008 gmol as given by the period table. Note About Molecular Mass and Isotopes. Molar Mass Calculator Molar Mass Molecular Mass Relative Atomic Mass One atomic mass unit u is equal to 112 the mass of one atom of carbon-12. . Enter a chemical formula to calculate its molar mass eg. The sum of all the mole fractions is equal to 1. The mass molarity calculator tool calculates the mass of compound required to achieve a specific molar concentration and volume. Mass molar concentration volume and formula weight are related to each other as follows. Molar mass is the mass in atomic mass units of one mole of a of a substance. Therefore the molar mass of a substance can be calculated by adding the atomic masses of each element present in that molecule. The mass of the sample containing about 6 023 1 0 23 6023 times 10 23 6 023 1 0 23 atoms or molecules see Avogadro number. Mass g Conce