A study of hydrogen bonding in methanol vapor by measurement of thermal conductivity

摘要

The thermal conductivity of methanol vapor was measured in a modified thick hothyphen;wire cell between 307 and 345 K at pressures ranging from approximately 50 torr up to a maximum of 1 atm. Analysis of the experimental data indicates that a tetrameric species is the principal source of the observed enhancement of the thermal conductivity of the vapor due to association reactions. Equilibrium constants for the reaction 4CH3OHquest; (CH3OH)4were determined from the thermal conductivity data. The enthalpy of formation of the methanol tetramer is minus;23.73 kcal/mole and the entropy of formation is minus;80.92 cal/molethinsp;K.