Molecular masses

List the molecular masses of carbon dioxide, oxygen, and helium: (g/mole)
    Carbon dioxide- 44
1 atom of carbon = 12
1 atom of oxygen = 16
12 + 2(16) = 44

    Oxygen- 32
1 atom of oxygen = 16
2(16) = 32

    Helium- 4
1 atom of helium = 4
1(4) = 4

    Water- 18
1 atom of hydrogen = 1
1 atom of oxygen =  16
2(1) + 16 = 18