How would you differentiate between relative atomic mass and relative molar mass?

1 Answer
May 30, 2017

Well, look at the roots. It is fairly evident that relative atomic mass applies only to atoms. On the other hand, relative molar mass applies to anything that there can be a #"mol"# of, meaning anything that you can count.

Therefore, "relative molar mass" is more general, and "relative atomic mass" is only for atoms.

  • #"Ne"# has a relative atomic mass of #"20.1797 g/mol"#, and that is its relative molar mass as well.
  • #"NaOH"# has a relative molar mass of #"39.9959 g/mol"#, but has no relative atomic mass to speak of, for it is not an atom.