The thermodynamics of vaporization of 1,3,5-trimethyladamantane

The boiling points of 1,3,5-trimethyladamantane were determined ebulliometr ically at saturated vapor pressures 6.2-99.6 kPa. Equations describing the temperature dependence of saturated vapor pressure and of the enthalpies of vaporization were obtained, and the normal boiling temperature was calcula ted. The enthalpy of vaporization at 313.15 K was determined calorimetrical ly; the Delta(nu)H(o) values obtained by two methods coincided to within th e error of measurements. The density of the substance was measured in the t emperature range 293-303 K. The experimental data were used to calculate th e critical parameters. The vapor pressure data were extrapolated to the who le region of the existence of the liquid phase from the triple to the criti cal point.