helllp

I did a simple distillation and a fractional distillation to purify acetone. How do I determine the concentration of acetone? (Instructions say this is not a simple M=mol/L calculation). My guess was to divide the volume of purified acetone by the volume...

I know the initial volume of unpurified acetone (before distillation) and the final volume of acetone (after distillation)

Yes, I have the volume of the purified acetone

Information: -mass (of both unpurified and purified acetone) -volume -boiling point temperature (not sure if that's relevant)

I also have the density of the distillate. I don't know what the initial and final purity of the mixes is, we were just told we were distilling "unpurified" acetone.