Molar and molecular weight of P2O3

• Relative molecular weight of P2O3: 109.945724
• Molar mass of P2O3: 109.945724 g/mol (0.10995 kg/mol)

Calculation of the relative molecular and molar mass of P2O3

• Mr[P2O3] = Ar[P] * 2 + Ar[O] * 3 = 30.973762 * 2 + 15.9994 * 3 = 109.945724
• Molar mass (kg/mol) = Mr[P2O3] : 1000 = 109.945724 : 1000 = 0.10995 kg/mol

P2O3: percent composition by element

• Phosphorus (P) = 61.947524 : 109.945724 * 100 = 56.344 %
• Oxygen (O) = 47.9982 : 109.945724 * 100 = 43.656 %

Molar mass calculator