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# Butane Vapor Pressure

ACTSCI-XTSQAY

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.

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

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.

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

Based on the data from Experiment 3, which of the following values would be CLOSEST to the vapor pressure of butane?

A

$8.77 \ mmHg$

B

$14.9 \ mmHg$

C

$1290 \ mmHg$

D

$6390 \ mmHg$