The vapor pressure of liquid iodomethane, CH_3I, is 100. mm Hg at 266 K. A sampl

Question

The vapor pressure of liquid iodomethane, CH_3I, is 100. mm Hg at 266 K. A sample of CH_3I is placed in a closed, evacuated 515 mL container at a temperature of 266 K. It is found that all of the CH_3I is in the vapor phase and that the pressure is 53.0 mm Hg. If the volume of the container is reduced to 324 mL, at constant temperature, which of the following statements are correct? Choose all that apply: Only iodomethane vapor will be present. Some of the vapor initially present will condense. The pressure in the container will be 100. mm Hg. No condensation will occur. Liquid iodomethane will be present.

Explanation / Answer

Initially, P = 53.0 mm Hg, V= 515 ml

Finallly, P = ?, V= 324 ml

Using P1V1=P2V2, P2= 84.24 mm Hg < equilibrium vapour pressure

Hence, only vapour phase is present, no condensation takes place.

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