Molar and molecular weight of ZnO

• Molecular formula: ZnO or OZn
• Relative molecular weight of ZnO: 81.4084
• Molar mass of ZnO: 81.4084 g/mol (0.08141 kg/mol)

Calculation of the relative molecular and molar mass of ZnO

• Mr[ZnO] = Ar[O] + Ar[Zn] = 15.9994 + 65.409 = 81.4084
• Molar mass (kg/mol) = Mr[ZnO] : 1000 = 81.4084 : 1000 = 0.08141 kg/mol

ZnO: percent composition by element

• Oxygen (O) = 15.9994 : 81.4084 * 100 = 19.653 %
• Zinc (Zn) = 65.409 : 81.4084 * 100 = 80.347 %

Molar mass calculator