Chapter 8, Problem 8.87PAE

8.87 Use the vapor pressure curves illustrated here to answer the questions that follow.

(a) What is the vapor pressure of ethanol $\left({\text{C}}_{\text{2}}{\text{H}}_{\text{5}}\text{OH}\right)$ at 60°C?

(b) Considering only carbon disulfide $\left({\text{CS}}_{\text{2}}\right)$ and ethanol, which has the stranger intermolecular forces in the liquid state?

(c) At what temperature does heptane $\left({\text{C}}_{\text{7}}{\text{H}}_{\text{16}}\right)$ have a vapor pressure of 500 mm Hg?

(d) What are the approximate normal boiling pains of each of the three substances?

(e) At a pressure of 400 mm Hg and a temperature of 70°C, is each substance a liquid, a gas, or a mixture of liquid and gas?