[SOLVED] Calculate molar masses in excel Hi all. Does anyone know of some MS excel macros for easily calculating atomic/molar masses? After googling for hours the only (decent) one I can find is chemacro. Unfortunately it is supposedly a mac .sit file, but every windows program I've tried - including Stuffit - says it's not a valid archive. Maybe a mac user could extract it for me? Or are there other similar free macros out there?