Molar and molecular weight of KNO3

• Relative molecular weight of KNO3: 101.1032
• Molar mass of KNO3: 101.1032 g/mol (0.1011 kg/mol)

Calculation of the relative molecular and molar mass of KNO3

• Mr[KNO3] = Ar[K] + Ar[N] + Ar[O] * 3 = 39.0983 + 14.0067 + 15.9994 * 3 = 101.1032
• Molar mass (kg/mol) = Mr[KNO3] : 1000 = 101.1032 : 1000 = 0.1011 kg/mol

KNO3: percent composition by element

• Potassium (K) = 39.0983 : 101.1032 * 100 = 38.672 %
• Nitrogen (N) = 14.0067 : 101.1032 * 100 = 13.854 %
• Oxygen (O) = 47.9982 : 101.1032 * 100 = 47.474 %

Molar mass calculator