Activity 2 - Molecular Masses

List the molecular masses of carbon dioxide, oxygen, and helium.
Molecular mass of carbon dioxide (CO2) =44
Molecular mass of water (H20) =18
Molecular mass of helium (He) = 4
Molecular mass of oxygen (02) =32

Explain how you get this from the Periodic Table.
Molecular mass of oxygen (02) = (2 X 16( the atoms present)) = 32 g/mole.