I did a lab in chemistry in which 15-mL jumbo Beral pipets with acetone was heated in boiling water until all of the liquid evaporated. Then the pipets were placed into room temperature water so that the evaporated liquid turns into condensed vapor. The molar mass was later found using mass, temperature, pressure, and volume.

Question

I did a lab in chemistry in which 15-mL jumbo Beral pipets with acetone was heated in boiling water until all of the liquid evaporated. Then the pipets were placed into room temperature water so that the evaporated liquid turns into condensed vapor. The molar mass was later found using mass, temperature, pressure, and volume.
What effect would vapor condensation in the neck of the pipets (not the bulb, but the longer part of the pipet) affect the mass of the pipets?
(To me, it doesn't seem like there would be too much difference on whether the vapor condensation occured in the neck or the bulb since the mass of the pipet would still be the same in either place. However, I'm guessing that there should probably be some sort of error when it's condensed in the neck and not the bulb?)