Molecular Masses

The molecular masses of the following:

H₂O

    Mass of H = 1.0097

    Mass of O = 15.999

    => Mass of H2O = 1 + 1 +16 = 18g/mole

CO₂

     Mass of C = 12

    Mass of O = 16

    => Mass of CO2 = 12 + 16 +16 = 44

O₂

     Mass of O = 15.999

    => Mass of O₂ = 16 + 16 = 32

He

    Mass of He = 4.0026

    => Mass of He = 4