Barium nitrate has a molar mass of 261.32 g/mol. The chemical formula for this salt containing barium and nitrate is Ba(NO3)2. At room temperature, it is a white solid.
Calculate the molar masses of all the atoms in Ba(NO3)2 to determine its molar mass. The Periodic Table of the Elements can be used to find the molar mass of each atom. The atoms that make up barium nitrate are barium, nitrogen, and oxygen, with molar weights of 137.3, 14.01, and 16 grammes, respectively. When you add the molar masses together, you get 261.32 grammes: 137.3 + (214.01) + (616). Barium nitrate has a molar mass of 261.32 grammes.