Molar and molecular weight of K2O7S2

• Molecular formula: K2O7S2 or K2S2O7
• Relative molecular weight of K2O7S2: 254.3224
• Molar mass of K2O7S2: 254.3224 g/mol (0.25432 kg/mol)

Calculation of the relative molecular and molar mass of K2O7S2

• Mr[K2O7S2] = Ar[K] * 2 + Ar[O] * 7 + Ar[S] * 2 = 39.0983 * 2 + 15.9994 * 7 + 32.065 * 2 = 254.3224
• Molar mass (kg/mol) = Mr[K2O7S2] : 1000 = 254.3224 : 1000 = 0.25432 kg/mol

K2O7S2: percent composition by element

• Potassium (K) = 78.1966 : 254.3224 * 100 = 30.747 %
• Oxygen (O) = 111.9958 : 254.3224 * 100 = 44.037 %
• Sulfur (S) = 64.13 : 254.3224 * 100 = 25.216 %

Molar mass calculator