Activity 2 1-18-11 Molecular Masses

List the molecular masses of carbon dioxide, oxygen, and helium. Explain how you get this from the Periodic Table.
Carbon dioxide-CO2  44
12+16+16=44g/mole

Oxygen-O2  32
16 + 16=32g/mole

Helium-He  4
4g/mole

Water-H2O   18
1+1+16= 18g/mole