Molar and molecular weight of KMnO4

• Relative molecular weight of KMnO4: 158.033945
• Molar mass of KMnO4: 158.033945 g/mol (0.15803 kg/mol)

Calculation of the relative molecular and molar mass of KMnO4

• Mr[KMnO4] = Ar[K] + Ar[Mn] + Ar[O] * 4 = 39.0983 + 54.938045 + 15.9994 * 4 = 158.033945
• Molar mass (kg/mol) = Mr[KMnO4] : 1000 = 158.033945 : 1000 = 0.15803 kg/mol

KMnO4: percent composition by element

• Potassium (K) = 39.0983 : 158.033945 * 100 = 24.74 %
• Manganese (Mn) = 54.938045 : 158.033945 * 100 = 34.763 %
• Oxygen (O) = 63.9976 : 158.033945 * 100 = 40.496 %

Molar mass calculator