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.... multiplying these percentages by the masses
and summing,
we get the average atomic mass of natural oxygen as:
15.99941
and this is the number I find on my periodic table.
If we figure the molecular mass of O2 by
simply doubling this number, we get:
31.99881
.... If we do the statistics [for the various flavors
of O2 molecule] we actually get:
31.99881
which is the same number as obtained by simply
doubling the average atomic mass found on
the periodic table.
Think about this for a minute.
Chemists [have] beenway to allow us to find average natural molecular > masses by simply
doing it right. The atomic masses on the periodic table
are the weighted averages (weighted by natural abundance)
of the atomic masses (not mass numbers) of the naturally
occurring isotopes of the elements. It is specifically done > this