To know an atomic mass of an element or to calculate a molecular mass of a substance, enter the symbol of the element or the molecular formula of the substance. For example:
write F - The atomic mass of Fluor should be MA = 18.99840 u,
write C3H3F3Cl2 - The molecular mass of Dichlorotrifluoropropane should be
M = 166.95713 g/mole,
write (C3F6)3 - The molecular mass of Hexafluoropropene trimer should be
M = 450.06756 g/mole.