Dumas Method for molecular mass of a volatile liquid?

Question

When a student performs this experiment, he notices that when he removes the flask with the sample from the boiling water bath, a liquid appears in the flask. What is the source of this liquid, and does it's presence introduce an error into the experimental results? Explain.

Answer 1

as long as you sealed off the flask before taking it out of the boiling water, and while in the boiling water, all of the unknown had evaporated,...

then the "liquid appears in the flask." is merely condensate of your unknown as the temp lowers when out of the hot water

so their will be no error

that is just  some of the stuff which had evaporated to fill the flask with gas, at the higher temp