Molar and molecular weight of MgO

• Relative molecular weight of MgO: 40.3044
• Molar mass of MgO: 40.3044 g/mol (0.0403 kg/mol)

Calculation of the relative molecular and molar mass of MgO

• Mr[MgO] = Ar[Mg] + Ar[O] = 24.305 + 15.9994 = 40.3044
• Molar mass (kg/mol) = Mr[MgO] : 1000 = 40.3044 : 1000 = 0.0403 kg/mol

MgO: percent composition by element

• Magnesium (Mg) = 24.305 : 40.3044 * 100 = 60.304 %
• Oxygen (O) = 15.9994 : 40.3044 * 100 = 39.696 %

Molar mass calculator