Molar and molecular weight of KBr

• Molecular formula: KBr or BrK
• Relative molecular weight of KBr: 119.0023
• Molar mass of KBr: 119.0023 g/mol (0.119 kg/mol)

Calculation of the relative molecular and molar mass of KBr

• Mr[KBr] = Ar[Br] + Ar[K] = 79.904 + 39.0983 = 119.0023
• Molar mass (kg/mol) = Mr[KBr] : 1000 = 119.0023 : 1000 = 0.119 kg/mol

KBr: percent composition by element

• Bromine (Br) = 79.904 : 119.0023 * 100 = 67.145 %
• Potassium (K) = 39.0983 : 119.0023 * 100 = 32.855 %

Molar mass calculator