| Abstract
| - The vapor pressure of 2-amino-3-methylpyridine was measured in the temperature range of (328.70 to 499.88) Kusing the boiling point method. The Antoine equation was used to describe the vapor pressure data, and theparameters in the equation were determined by means of the least-square regression method. The deviation ofexperimental data from the corresponding calculated values was within 0.30 %. On the basis of the equation, theenthalpy of vaporization of 2-amino-3-methylpyridine at normal boiling point (Tb) was obtained from the slopeof the plot of ln p vs 1/T. The standard enthalpy of vaporization ΔvapH(298.15 K) was estimated by Othmer'smethod. Using 3-methylpyridine as the standard substance, the value of ΔvapH(298.15 K) was found to be 62.58kJ·mol-1. A parallel value of ΔvapH(298.15 K) was also obtained using benzene as the standard substance.Additionally the Watson relation was employed to verify the value of ΔvapH(298.15 K), from which it was shownthat the value of the standard enthalpy of vaporization was acceptable.
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