Molar and molecular weight of MgSO4

• Molecular formula: MgSO4 or MgO4S
• Relative molecular weight of MgSO4: 120.3676
• Molar mass of MgSO4: 120.3676 g/mol (0.12037 kg/mol)

Calculation of the relative molecular and molar mass of MgSO4

• Mr[MgSO4] = Ar[Mg] + Ar[O] * 4 + Ar[S] = 24.305 + 15.9994 * 4 + 32.065 = 120.3676
• Molar mass (kg/mol) = Mr[MgSO4] : 1000 = 120.3676 : 1000 = 0.12037 kg/mol

MgSO4: percent composition by element

• Magnesium (Mg) = 24.305 : 120.3676 * 100 = 20.192 %
• Oxygen (O) = 63.9976 : 120.3676 * 100 = 53.168 %
• Sulfur (S) = 32.065 : 120.3676 * 100 = 26.639 %

Molar mass calculator