The vapor pressure of liquid acetone, CH3COCH3, is 40.0 mm Hg at 264 K. A sample
ID: 477227 • Letter: T
Question
The vapor pressure of liquid acetone, CH3COCH3, is 40.0 mm Hg at 264 K. A sample of CH3COCH3 is placed in a closed, evacuated container of constant volume at a temperature of 402 K. It is found that all of the CH3COCH3 is in the vapor phase and that the pressure is 50.0 mm Hg. If the temperature in the container is reduced to 264 K, which of the following statements are correct? Choose all that apply.
a. The pressure in the container will be 40.0 mm Hg.
b. No condensation will occur.
c. Liquid acetone will be present.
d. Some of the vapor initially present will condense.
e. Only acetone vapor will be present.
Explanation / Answer
Since saturation pressure depends on Temperature only in accordance to Antione's equation, when the temperature is brought back to 264 K the vapour pressure will again be 40 mm Hg. So answer is A
Since at 402 K, all the acetone was in vapour form with a pressure of 50 mm Hg, so when you decrease the temperature back to 264 K, liquid acetone will also be present in equilibrium with the vapour. So answer is C.
Hence, answer is A and C
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