Chemistry

Hi!
there's 3 questions..if you can help on any that'd be great..thanks!

1. Volatile liquids with lower boiling points often give better results than those with higher boiling points. Suggest a reason for this.

2. What effect would vapor condensation in the neck of the 15-mL Beral-type pipets have on the reported molar mass? How large an error might this introduce?

3. Some liquids have enough attractions between molecules to form dimers. (Dimers are molecules formed from the combination of identical molecules, A + A --> A2.) What effect would this have on the experimental molar mass?



You need to give some more details. I have no idea what kind of experiment you are doing. And with regard to question 1, "give better results (for what) than those with higher boiling points.

we are determining the molar masses of various volatile liquids: ethyl alcohol, acetone, and isopropyl alcohol. The liquids are volatized and condensed to a fixed volume. The condensed vapor is massed and the liquid's molar mass is calculated from the experimental data.

sry!..that was me up there!...that's the explanation of the lab.

ffff

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asked by AG
  1. Ap Chem lab on Determination of the Molar Mass of volatile liquids.

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  2. I am stuck on the same questions.
    the answer to number one is along the lines of the results are more accurate with the lower temperatures because the preasure and weight are easier to determine

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