Suppose a chemist has chosen 10 to the power of 20 as the number of particles in a mole, what would be the molecular mass of oxygen gas?

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3 ANSWERS



Alexander Mathey, former Chemical Engineer, retired, lives in Athens, GR

Answered Oct 8, 2017

Avogadro’s number is the number of atoms (or molecules) in a gram-atom (or gram-molecule) of substance.

It is therefore tied to the definition of1 g = 1 kg*10^(-3).

If you would introduce some other number of atoms (or molecules) as a new unit, say “Newmol”, this would in no way change the Atomic (or Molecular) Mass of elements and compounds, since these are calculated in Atomic Mass Units (AMUs), where 1 AMU is:

“1/12 of the mass of an unbound neutral atom of carbon-12 in its nuclear and electronic ground state and at rest”.

You see, grams, or any other man-made unit of mass, doesn’t enter the definition of AMU