>We need to get between grams and a count of molecules, that's the number. I think that number is only true for carbon-12. >but then we would have some other

>We need to get between grams and a count of molecules, that's the number. I think that number is only true for carbon-12. >but then we would have some other arbitrary constant we would have to memorize to go from grams to a count of molecules. I think we already have to do that, hence molar mass.