Molar and molecular weight of KClO4

• Molecular formula: KClO4 or ClKO4
• Relative molecular weight of KClO4: 138.5489
• Molar mass of KClO4: 138.5489 g/mol (0.13855 kg/mol)

Calculation of the relative molecular and molar mass of KClO4

• Mr[KClO4] = Ar[Cl] + Ar[K] + Ar[O] * 4 = 35.453 + 39.0983 + 15.9994 * 4 = 138.5489
• Molar mass (kg/mol) = Mr[KClO4] : 1000 = 138.5489 : 1000 = 0.13855 kg/mol

KClO4: percent composition by element

• Chlorine (Cl) = 35.453 : 138.5489 * 100 = 25.589 %
• Potassium (K) = 39.0983 : 138.5489 * 100 = 28.22 %
• Oxygen (O) = 63.9976 : 138.5489 * 100 = 46.191 %

Molar mass calculator