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# Determine Formula

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A 255 mL round bottom flask is weighted and found to have a mass of 114.85g. A few milliliters of an easily vaporized liquid are added to the flask and the flask is immersed in a boiling water bath. All of the liquid vaporizes at the boiling point of water, filling the flask with vapor at 101,325 Pa. When all the liquid has vaporized, the flask is removed from the bath and cooled, dried and reweighed. The new mass of the flask and condensed vapor is 115.23 g. Which of the following compounds could the liquid be?

C4H10
C3H7OH
C2H6
C2H5OH
C4H9OH

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#### Solution Preview

We will use the ideal gas equation to solve this problem.

PV = nRT

What variables do we know?

P = 101,325 Pa
V = 255 mL
T = 100 degrees C
R = 0.08206 L-atm/mol-K

Therefore, we can solve for n, the number of moles by rearranging the equation like this:

n = PV/RT

First, you will need ...

#### Solution Summary

A 255 mL round bottom flask is weighted and found to have a mass of 114.85g. A few milliliters of an easily vaporized liquid are added to the flask and the flask is immersed in a boiling water bath. All of the liquid vaporizes at the boiling point of water, filling the flask with vapor at 101,325 Pa. When all the liquid has vaporized, the flask is removed from the bath and cooled, dried and reweighed. The new mass of the flask and condensed vapor is 115.23 g. Which of the following compounds could the liquid be?

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