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
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