[e071585]

This is not a homework problem but a observation from material balance I was doing for work.

A mole of a compound is the molecular weight of that compound.  i.e. a mole of oxygen is 16 grams.  This is 6.02 x 10^23 atoms of oxygen.  But if I have 16 lbs of oxygen the number of oxygen atoms will be  453 x 6.02 x 10^23 because there are 453 grams in a pound.

Has anyone else made the same observation. 

[Yggdrasil]

That is a correct observation.  Basically, 6.02x10²³ is the conversion from atomic mass units (Daltons) to grams.  There are 6.02x10²³ amu in one gram.

[cherrybarry]

that is b/c avogodro's number is for gram-moles...when u refer to moles, it is actually "gram-moles", because u can also have lb-moles, kg-moles, etc. And the conversion among these is the same as for the mass units.