Molar and molecular weight of B2O3

• Relative molecular weight of B2O3: 69.6202
• Molar mass of B2O3: 69.6202 g/mol (0.06962 kg/mol)

Calculation of the relative molecular and molar mass of B2O3

• Mr[B2O3] = Ar[B] * 2 + Ar[O] * 3 = 10.811 * 2 + 15.9994 * 3 = 69.6202
• Molar mass (kg/mol) = Mr[B2O3] : 1000 = 69.6202 : 1000 = 0.06962 kg/mol

B2O3: percent composition by element

• Boron (B) = 21.622 : 69.6202 * 100 = 31.057 %
• Oxygen (O) = 47.9982 : 69.6202 * 100 = 68.943 %

Molar mass calculator