The molecular weight of CaCl2 is 110.984 grams per mole. The molecular weight is the combined atomic weights of each atom contained within a compound. The chemical formula CaCl2 represents the compound calcium chloride.
Using the chemical formula, the molecule can be seen to have one atom of calcium and two atoms of chlorine. Since the atomic weight of one atom of chlorine is equal to 35.45 grams per mole, the two atoms in the molecule carry a weight of 70.9 grams per mole, which is added to the atomic weight of 40.07 grams per mole for one atom of calcium.