Unless the molecular weight is about 10 pentillion (?) you ain't gonna see diddly! Avogadro's number is a big thing. (6 x 10^23). Now agreed that you don't need a mole of something (especially w/ a high molecular weight) to be able to see it in a microscope. But it's probably at least w/in 4 to 5 orders of magnitude of the right number.