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A student is conducting an experiment to determine what factors affect the vapor pressure of methanol. The student is measuring the vapor pressure of methanol using a mercury manometer, as pictured below. The experimental apparatus has an evacuated 1.0 liter bulb, into which the student injects a measured amount of methanol.

The methanol then vaporizes to a gas until the vapor pressure equilibrates with the liquid, by saturating the bulb volume with methanol vapor. The temperature of the methanol is controlled by placing it in a water bath. The student measures the vapor pressure by determining the height of the mercury column after the methanol is injected.

Created for Albert.io. Copyright 2016. All rights reserved.

Experiment 1 Results
The student first tried varying the volume of methanol injected into the bulb.

Created for Albert.io. Copyright 2016. All rights reserved.

Experiment 2 Results
Next, the student tried varying the temperature of a fixed volume of methanol. The student made sure there was always methanol liquid in the glass bulb when the measurement of vapor pressure was taken.

Created for Albert.io. Copyright 2016. All rights reserved.

Experiment 3 Results
Finally, the student tried measuring the vapor pressure of different substances, both with and without alcohol (-OH) groups, at 20° C.

What would be the effect on the results of Experiment 2 if the volume of the bulb was doubled?

A

There would be no change in the relationship between the temperature and the vapor pressure.

B

The vapor pressure would increase more slowly as the temperature was increased.

C

The vapor pressure would increase more quickly as the temperature was increased.

D

The increased volume would make the vapor pressure lower and it would not change with temperature.

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