Molar and molecular weight of He

• Relative molecular weight of He: 4.002602
• Molar mass of He: 4.002602 g/mol (0.004 kg/mol)

Calculation of the relative molecular and molar mass of He

• Mr[He] = Ar[He] = 4.002602 = 4.002602
• Molar mass (kg/mol) = Mr[He] : 1000 = 4.002602 : 1000 = 0.004 kg/mol

Molar mass calculator