The vapor pressure of liquid bromoethane , C 2 H 5 Br , is 40.0 mm Hg at 246 K.
ID: 1069434 • Letter: T
Question
The vapor pressure of liquid bromoethane, C2H5Br, is 40.0 mm Hg at 246 K.
A sample of C2H5Br is placed in a closed, evacuated container of constant volume at a temperature of 387 K. It is found that all of the C2H5Br is in the vapor phase and that the pressure is 58.0 mm Hg. If the temperature in the container is reduced to 246 K, which of the following statements are correct?
Choose all that apply.
Some of the vapor initially present will condense.
Liquid bromoethane will be present.
No condensation will occur.
Only bromoethane vapor will be present.
The pressure in the container will be 40.0 mm Hg.
Explanation / Answer
Since at 246 K, vapour pressure is 40.0 mm Hg,
some of the vapour will condense and vapour pressure will reduce to 40.0 mm Hg
Answer:
Some of the vapor initially present will condense.
Liquid bromoethane will be present.
The pressure in the container will be 40.0 mm Hg.
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