Molar and molecular weight of H3PO3

• Relative molecular weight of H3PO3: 81.995782
• Molar mass of H3PO3: 81.995782 g/mol (0.082 kg/mol)

Calculation of the relative molecular and molar mass of H3PO3

• Mr[H3PO3] = Ar[H] * 3 + Ar[P] + Ar[O] * 3 = 1.00794 * 3 + 30.973762 + 15.9994 * 3 = 81.995782
• Molar mass (kg/mol) = Mr[H3PO3] : 1000 = 81.995782 : 1000 = 0.082 kg/mol

H3PO3: percent composition by element

• Hydrogen (H) = 3.02382 : 81.995782 * 100 = 3.688 %
• Phosphorus (P) = 30.973762 : 81.995782 * 100 = 37.775 %
• Oxygen (O) = 47.9982 : 81.995782 * 100 = 58.537 %

Molar mass calculator