The vapor pressure of liquid ethyl amine , C 2 H 5 NH 2 , is 40.0 mm Hg at 233 K
ID: 521183 • Letter: T
Question
The vapor pressure of liquid ethyl amine, C2H5NH2, is 40.0 mm Hg at 233 K.
A sample of C2H5NH2 is placed in a closed, evacuated container of constant volume at a temperature of 349 K. It is found that all of the C2H5NH2 is in the vapor phase and that the pressure is 63.0 mm Hg. If the temperature in the container is reduced to 233 K, which of the following statements are correct?
Choose all that apply.
Liquid ethyl amine will be present.
No condensation will occur.
Only ethyl amine vapor will be present.
The pressure in the container will be 42.1 mm Hg.
Some of the vapor initially present will condense.
Explanation / Answer
Since at 233 K it is in liquid state and has certain vapour pressure, so, reduction of temeprature from 349 where it is in vapour phase to 233 K , it causes to condense some of the vapor to liquid.
So, at this temperature both liquid and vapour phase of ethyl amine will be present.
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