The molar mass of potassium nitrate, which is represented by the chemical formula KNO3, is 101.10 grams per mole. The molar mass is determined by adding together the atomic weight of each atom in the compound.
Potassium nitrate contains one atom of potassium, represented by the chemical symbol K, for a total weight of 39.09 grams per mole. It also contains a single atom of nitrogen, depicted by the symbol N, which has a weight of 14 grams per mole. It contains three atoms of oxygen, each with an individual weight of 15.99 grams per mole, for a total of 47.97 grams per mole.