http://www.nyu.edu/pages/mathmol/textbook/density.html (http://www.nyu.edu/pages/mathmol/textbook/density.html)
Hi! Search e.g. on http://chemfinder.cambridgesoft.com/ (http://chemfinder.cambridgesoft.com/)
for the density of your specific compound.
A couple of month ago i wanted to 'measure' the purity of the safrole which i got after fractional distilling my sassafrasoil. I searched the hive for some info and i was told (hope they old me the truth...) that for example the density of Safrole is 1.096 g/cc at 20°C. This means that 1ml of Safrole at 20C has 1.096g. I don't have an expensive scale, that's why i weighted 100ml of my oil, the scale showed 109.5 g . Now i knew that this should be safole. Maybe this helps, greetings