The vapor pressure of liquid carbon disulfide, CS2, is 40.0 mm Hg at 251 K A sam
ID: 1081878 • Letter: T
Question
The vapor pressure of liquid carbon disulfide, CS2, is 40.0 mm Hg at 251 K A sample of CS2 is placed in a closed, evacuated container of constant volume at a temperature of 388 K It is found that all of the CS, is in the vapor phase and that the pressure is 58.0 mm Hg. If the temperature in the container is reduced to 251 K, which of the following statements are correct? Choose all that apply Only carbon disulfide vapor will be present. No condensation will occur Liquid carbon disulfide will be present. Some ofthe vapor initially present will condense. The pressure in the container will be 40 0 mm Hg.Explanation / Answer
we know,
P1 / T1 = P2 / T2
58.0 / 388 = P2 / 251
P2 = 37.5 mm Hg.
so when temperature is 251 K then pressure is 37.5 mm Hg.
That means pressure decreases.
As the vapor pressure decreases, some of the CS2 vapor condenses to liquid CS2.
so correct staements are
liquid carbon disulfide will be present.
some of the vapor initially present will condense.
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