Molar and molecular weight of O4Os

• Molecular formula: O4Os or OsO4
• Relative molecular weight of O4Os: 254.2276
• Molar mass of O4Os: 254.2276 g/mol (0.25423 kg/mol)

Calculation of the relative molecular and molar mass of O4Os

• Mr[O4Os] = Ar[O] * 4 + Ar[Os] = 15.9994 * 4 + 190.23 = 254.2276
• Molar mass (kg/mol) = Mr[O4Os] : 1000 = 254.2276 : 1000 = 0.25423 kg/mol

O4Os: percent composition by element

• Oxygen (O) = 63.9976 : 254.2276 * 100 = 25.173 %
• Osmium (Os) = 190.23 : 254.2276 * 100 = 74.827 %

Molar mass calculator