The vapor pressure of liquid acetone , CH 3 COCH 3 , is 100 . mm Hg at 281 K. A
ID: 1044784 • Letter: T
Question
The vapor pressure of liquid acetone, CH3COCH3, is 100. mm Hg at 281 K.
A sample of CH3COCH3 is placed in a closed, evacuated 525 mL container at a temperature of 281 K. It is found that all of the CH3COCH3 is in the vapor phase and that the pressure is 64.0 mm Hg. If the volume of the container is reduced to 308 mL at constant temperature, which of the following statements are correct?
Choose all that apply.
Only acetone vapor will be present.
Some of the vapor initially present will condense.
No condensation will occur.
Liquid acetone will be present.
The pressure in the container will be 109 mm Hg.
Explanation / Answer
Only acetone vapor will be present.
No condensation will occur.
from boyles law,
P1V1 = P2V2
(525*64) = (P2*308)
P2 = final pressure = 109 mmhg
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