Molar and molecular weight of K2S2O8

• Molecular formula: K2S2O8 or K2O8S2
• Relative molecular weight of K2S2O8: 270.3218
• Molar mass of K2S2O8: 270.3218 g/mol (0.27032 kg/mol)

Calculation of the relative molecular and molar mass of K2S2O8

• Mr[K2S2O8] = Ar[K] * 2 + Ar[O] * 8 + Ar[S] * 2 = 39.0983 * 2 + 15.9994 * 8 + 32.065 * 2 = 270.3218
• Molar mass (kg/mol) = Mr[K2S2O8] : 1000 = 270.3218 : 1000 = 0.27032 kg/mol

K2S2O8: percent composition by element

• Potassium (K) = 78.1966 : 270.3218 * 100 = 28.927 %
• Oxygen (O) = 127.9952 : 270.3218 * 100 = 47.349 %
• Sulfur (S) = 64.13 : 270.3218 * 100 = 23.724 %

Molar mass calculator