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Re: molecular weight of dry air



According to a chemistry book "the molecular mass is a dimensionless
quality defined as the ratio of the average mass per molecule divided
by 1/12 of the mass of an atom of carbon-12. The term relative
molecular mass thus replaces the older term 'molecular weight' ."
Ludwik Kowalski

Robert Cohen asked:
Is there a difference between "atomic mass" and "atomic weight"?
I thought the average atomic mass (over the isotopes) was called
the atomic weight and so it is the atomic weight that is listed
on the periodic table, not the atomic mass. Is that incorrect?