Molar and molecular weight of KOH

• Molecular formula: KOH or HKO
• Relative molecular weight of KOH: 56.10564
• Molar mass of KOH: 56.10564 g/mol (0.05611 kg/mol)

Calculation of the relative molecular and molar mass of KOH

• Mr[KOH] = Ar[H] + Ar[K] + Ar[O] = 1.00794 + 39.0983 + 15.9994 = 56.10564
• Molar mass (kg/mol) = Mr[KOH] : 1000 = 56.10564 : 1000 = 0.05611 kg/mol

KOH: percent composition by element

• Hydrogen (H) = 1.00794 : 56.10564 * 100 = 1.797 %
• Potassium (K) = 39.0983 : 56.10564 * 100 = 69.687 %
• Oxygen (O) = 15.9994 : 56.10564 * 100 = 28.517 %

Molar mass calculator