Molar and molecular weight of KCl

• Molecular formula: KCl or ClK
• Relative molecular weight of KCl: 74.5513
• Molar mass of KCl: 74.5513 g/mol (0.07455 kg/mol)

Calculation of the relative molecular and molar mass of KCl

• Mr[KCl] = Ar[Cl] + Ar[K] = 35.453 + 39.0983 = 74.5513
• Molar mass (kg/mol) = Mr[KCl] : 1000 = 74.5513 : 1000 = 0.07455 kg/mol

KCl: percent composition by element

• Chlorine (Cl) = 35.453 : 74.5513 * 100 = 47.555 %
• Potassium (K) = 39.0983 : 74.5513 * 100 = 52.445 %

Molar mass calculator