Molar and molecular weight of Na2S2O3

• Molecular formula: Na2S2O3 or Na2O3S2
• Relative molecular weight of Na2S2O3: 158.10773856
• Molar mass of Na2S2O3: 158.10773856 g/mol (0.15811 kg/mol)

Calculation of the relative molecular and molar mass of Na2S2O3

• Mr[Na2S2O3] = Ar[Na] * 2 + Ar[O] * 3 + Ar[S] * 2 = 22.98976928 * 2 + 15.9994 * 3 + 32.065 * 2 = 158.10773856
• Molar mass (kg/mol) = Mr[Na2S2O3] : 1000 = 158.10773856 : 1000 = 0.15811 kg/mol

Na2S2O3: percent composition by element

• Sodium (Na) = 45.97953856 : 158.10773856 * 100 = 29.081 %
• Oxygen (O) = 47.9982 : 158.10773856 * 100 = 30.358 %
• Sulfur (S) = 64.13 : 158.10773856 * 100 = 40.561 %

Molar mass calculator