The thermodynamic properties to the temperature 700 K of naphthalene and of 2,7-dimethylnaphthalene

摘要: Abstract Measurements leading to the calculation of standard thermodynamic properties gases are reported for naphthalene (Chemical Abstracts registry number [91-20-3]) and 2,7-dimethylnaphthalene (registry [582-16-1]). Experimental methods included adiabatic heat-capacity calorimetry, comparative ebulliometry, differential-scanning calorimetry (d.s.c.). The critical temperature was determined experimentally each compound, pressure density were derived from fitting procedures. Vapor-pressure measurements in literature compared with results obtained this research. Enthalpies vaporization sublimation experimental results. New self-consistent equations variation 2,7-dimethyl-naphthalene derived. For values entropies enthalpies liquid phase energy combustion combined present derive entropies, enthalpies, Gibbs free energies formation gaseous temperatures between 298.15 K 700 K. naphthalene(g) using statistical mechanics various fundamental vibrational-frequency assignments available literature. A scheme estimate functions alkylnaphthalenes updated. size barrier methyl-group rotation shown be about same as that toluene. Values 2-methylnaphthalene(g) range 300 estimated.