Vapor pressure (mm Hg) 900 800 700 600 500 400 300 200 100 0 10 Carbon disulfide Methanol 20 30 40 50 P Ethanol 60 70 Temperature (C) The intermolecular forces in propanol are Heptane 80 90 100 110 The vapor pressure of propanol is 400 mm Hg at 82.0 C. From the plot of vapor pressures vs temperature above, estimate the temperature at which the vapor pressure of heptane is 400 mm Hg. than the intermolecular forces in heptane.