What is formula unit of mass? How is it different from molecular mass?
The sum of atomic masses of all the atoms as present in the empirical or simple formula of a compound is called formula mass. The units of formula mass “atomic mass unit” (amu). For e.g NaCl= 23 + 35.5 = 58.5 amu. Formula mass and molecular mass are two terms used to find the mass of a molecule. The formula mass gives the mass of a molecule when the empirical formula of that molecule is considered. The molecular mass gives the mass of a molecule when the molecular formula of that molecule is considered.
