Question 11.2.2: Relate vapor pressure, enthalpy of vaporization, and IMFs. U......
Relate vapor pressure, enthalpy of vaporization, and IMFs.
Use the plot of vapor pressures versus temperature in Interactive Figure 11.2.4 to answer the following questions.
a. What is the approximate temperature at which the vapor pressure of heptane is 400 mm Hg?
b. Which liquid, methanol or heptane, has the higher enthalpy of vaporization?
You are asked to determine the temperature at which a liquid has a given vapor pressure and the relative magnitude of the enthalpy of vaporization for two liquids.
You are given a plot of vapor pressure vs. temperature.
a. Using Interactive Figure 11.2.4, the vapor pressure of heptane is 400 mm Hg at approximately 77 °C.
b. At any temperature, methanol has a higher vapor pressure than heptane. Therefore, the IMFs in heptane are stronger than the IMFs in methanol. The heat of vaporization of heptane would be expected to be higher than the heat of vaporization of methanol.