Exercises
Exercise 1. How does the vapor pressure of a substance change for the following changes?
a) The surface area of a liquid is decreased from 20 cm2 to 10 cm2
Increasing or decreasing the surface area has no effect.
b) The temperature is increased by 10oC
The vapor pressure will increase with increases in temperature
Exercise 2. Which of the following would have the highest vapor pressure? Explain.
a) CH3CH2COOH
b) CH3CH2OCH3
c) Hg (l)
CH3CH2OCH3 because this substance has the weakest interparticle forces.
b) CH3CH2OCH3
c) Hg (l)
CH3CH2OCH3 because this substance has the weakest interparticle forces.
Exercise 3. Which of the following would have the lowest vapor pressure? Explain.
a) CH2OHCH2OH
b) CH3CH2COOH
c) Hg(l)
b) CH3CH2COOH
c) Hg(l)
Liquid mercury because this substance has the strongest interparticle forces–metallic bonding.