Molar and molecular weight of As2O3

• Relative molecular weight of As2O3: 197.8414
• Molar mass of As2O3: 197.8414 g/mol (0.19784 kg/mol)

Calculation of the relative molecular and molar mass of As2O3

• Mr[As2O3] = Ar[As] * 2 + Ar[O] * 3 = 74.9216 * 2 + 15.9994 * 3 = 197.8414
• Molar mass (kg/mol) = Mr[As2O3] : 1000 = 197.8414 : 1000 = 0.19784 kg/mol

As2O3: percent composition by element

• Arsenic (As) = 149.8432 : 197.8414 * 100 = 75.739 %
• Oxygen (O) = 47.9982 : 197.8414 * 100 = 24.261 %

Molar mass calculator