Thermodynamic properties of cis-2-butene from 15 degrees to 1,500 degrees K

Abstract

The followin g properties of a sample of cis-2-butene, 99.94 percent pure~ were measured: (1 ) the sp ecifi c heat of solid and of li quid from 15° to 300 o K, (2) h eat of fusion at the triple point (130.25 into joule g_l) , (3) triple-point temperature ( -13S.900 ± O.OOSo C) , (4) heats of vaporization at several temperatures between 246° and 2 93°K, and (5) vapor pressure from 200° to 296°K. With these experimental data, calculations were made of (1) the normal boiling temperature (3.71S°C) , (2) volume of the saturatcd vap or, (3) ent ha lpy and ent ropy of the solid and the liquid from 0° to 300 0 K , and (4) entropy, enthalpy , and spccific heat of the vapor in the ideal gas state from 245° to 300°K, Thermodynamic functions for cis--2-butene in the idea.l ga.s state from 300° to l,500 0 K were calculated from spectroscopic data . Thermodynamic data for the cis-trans isomerization of 2-butene are included.

Test of the formal basis of Arrhenius law with heat capacities

“…The results of [7] obtained with catalysis are remarkably precise and compatible with previous, more partial measurements, as for instance [10]. Fig.4C and D show the comparison between values of equilibrium constants K Z→E obtained in [7] and the ratios of kinetic constants k Z→E /k E→Z based on the values measured in [6] and interpreted as either (i) the linear Arrhenius equations reported in [6], (ii) the Arrhenius equations modified to include reactant energies (Model I) and (ii) the probabilistic equation where reactant energies are envisioned as mean values (Model II).…”

Heat content, free-energy function, entropy, and heat capacity of ethylene, propylene, and the four butenes to 1,500 degrees-K

“…(b) cis-2-Butene A threefold restricting potential of 450 cal/mole for each methyl group was found to give satisfactory agreement with the experimental values of the entropy [7] and the gaseous heat capacity [8].…”

Thermodynamic properties of solid and liquid ethylbenzene from 0 to 300 degrees K

“…Calorimeter 0, used for the measurement of h eat of vaporization, was the same calorimeter that had been used for measurements on 1,3-butadiene [4] and cis-2-butene [5]. It was provided with a tube for withdrawing vapor from the sample container.…”