Molar and molecular weight of K2CO3

• Molecular formula: K2CO3 or CK2O3
• Relative molecular weight of K2CO3: 138.2055
• Molar mass of K2CO3: 138.2055 g/mol (0.13821 kg/mol)

Calculation of the relative molecular and molar mass of K2CO3

• Mr[K2CO3] = Ar[C] + Ar[K] * 2 + Ar[O] * 3 = 12.0107 + 39.0983 * 2 + 15.9994 * 3 = 138.2055
• Molar mass (kg/mol) = Mr[K2CO3] : 1000 = 138.2055 : 1000 = 0.13821 kg/mol

K2CO3: percent composition by element

• Carbon (C) = 12.0107 : 138.2055 * 100 = 8.69 %
• Potassium (K) = 78.1966 : 138.2055 * 100 = 56.58 %
• Oxygen (O) = 47.9982 : 138.2055 * 100 = 34.73 %

Molar mass calculator