CHEM 120 Study Guide - Midterm Guide: Benzene, Surface Tension, Hexane

The vapor pressure of liquid ethyl amine, , is at . A sample of is placed in a closed, evacuated container of constant volume at a temperature of . It is found that all of the is in the vapor phase and that the pressure is . If the temperature in the container is reduced to , which of the following statements is correct?

1. Liquid ethyl amine will be present.
2. The pressure in the container will be .
3. No condensation will occur.
4. Only ethyl amine vapor will be present.
5. Some of the vapor initially present will condense.

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 385 K. It is found that all of the CH3COCH3 is in the vapor phase and that the pressure is 60.0 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. No condensation will occur. B The pressure in the container will be 41.1 mm Hg. C Only acetone vapor will be present. D Liquid acetone will be present. E. Some of the vapor initially present will condense

2)

Use the following vapor pressure data to answer the questions:

Liquid Vapor preesure, torr Temperature C

Fe 10 2040

Bi 10 1060

1) In which liquid are the attractive forces the weakest ? ___BiFe Bi or Fe

(2) Which liquid would be expected to have the lowest heat of vaporization? ___BiFe Bi or Fe