Calculate the vapor pressure of butanol (b.p. 117 'C) at the gas chromatography column temperature of 9L0'C using the form of the Clausius-Clapeyron equation shown In , vap R where is the ideal gas constant, A. is the enthalpy of vaporization, 7 and 7, are two different temperatures, and and B are the vapor pressures at the respective temperatures. The enthalpy of vaporization can be estimated using Trouton's rule, , - (88J mol-.-) T. Pe Torr Calculate the vapor pressure of hexane (b.p. 69.0 C) at the same column temperature, P. Torr For compounds of the same chemical class, what is the relationship between vapor pressure of a compound and retention in gas chromatography? As the vapor pressure decreases, retention time decreases. As the vapor pressure increases, retention time increases. As the vapor pressure decreases, retention time increases. There is no relationship between vapor pressure and retention