[LiquidInfinity]

Hi, so I've been chewing at this lab writeup and hit a block...
What we did was make a monlayer of stearic acid in a "find Avogrado's #" experiment.  I have the density, volume, total surface area, grams, whateva'.  But , without using Avo's #, I am supposed to be able to determine the number of molecules->surface area of the "top" of a molecule w/assumed prism-like strucure->determine a value for avogrado's #.  Seems like a standard experiment used widely, and I did some searching, but all the help stuff like assumes that I'm not dumb and can figure this part out myself.  Everything else in the lab came together well, but this last bit is tripping me up.  

Thanks for the help