Molar and molecular weight of Na2S2O8

• Relative molecular weight of Na2S2O8: 238.10473856
• Molar mass of Na2S2O8: 238.10473856 g/mol (0.2381 kg/mol)

Calculation of the relative molecular and molar mass of Na2S2O8

• Mr[Na2S2O8] = Ar[Na] * 2 + Ar[S] * 2 + Ar[O] * 8 = 22.98976928 * 2 + 32.065 * 2 + 15.9994 * 8 = 238.10473856
• Molar mass (kg/mol) = Mr[Na2S2O8] : 1000 = 238.10473856 : 1000 = 0.2381 kg/mol

Na2S2O8: percent composition by element

• Sodium (Na) = 45.97953856 : 238.10473856 * 100 = 19.311 %
• Sulfur (S) = 64.13 : 238.10473856 * 100 = 26.934 %
• Oxygen (O) = 127.9952 : 238.10473856 * 100 = 53.756 %

Molar mass calculator