IUPAC definitions:
Bah, chemists and their weird ways.
relative molecular mass, relative molar mass
But that's different to non-relative molecular or molar mass.
The units for (absolute) molar mass is kg/mol, usually denoted by variable
M. Relative molar masses are unitless, and are usually denoted by variable
Mr. I don't understand how one can confuse the two; but then, I do physics, not chemistry, and do not recall ever seeing the relative quantities being used.
My original annoyance is that nowhere does weight come into it.
Yeah; I'm just
you with the "relative" detail.
Back to topic. A lot of physical phenomena are named after some physicist or other scientist, but I have always had difficulty associating the two. I much prefer descriptive names like "thermoelectric effect" over "Seebeck effect" or "Peltier effect". While the latter are not misnomers per se, I find them hard to remember and associate correctly.