Showing papers in "The Journal of Chemical Thermodynamics in 1998"

TL;DR: In this article, the vapour pressures of saturated aqueous solutions of NaCl, NaBr, NaNO3, Na NO2, KIO3, and RbCl were determined in the temperature rangeT=(278 to 323) K using an electronic hygrometer with an electrolyte sensor.

TL;DR: In this paper, Copyrigt et al. obtained properties such as speed of sound, density, and isentropic and isothermal compressibilities from ultrasonic speed measurements on two synthetic systems which are representative of distillation cuts with high bubble points.

TL;DR: In this paper, a single-sinker densimeter was developed for accurate density measurements in the technically and scientifically important regions of the (p, ρ,T) surface of fluids.

TL;DR: In this paper, the standard molar enthalpies of BaCeO3(s) and SceO3 (s, 298.15 K) were derived by combining the standard (1.00 mol·DM−3HCl+0.10 mol·dm−3KI) obtained from literature, and measurements of auxiliary data.

TL;DR: In this paper, the authors derived the molar enthalpies of cyclic amines of formation of gaseous compounds from the temperature dependence of the vapour pressure measured in a flow system.

TL;DR: In this article, the heat capacities of LaFeO 3 and LaCoO 3 have been determined by adiabatic calorimetry from T =(13 to 900) K and T = (13 to 1000) K, respectively.

TL;DR: In this article, the vapour pressure of saturated aqueous solutions of NH 4 I, KI, KNO 3, SrCl 2, Li 2 SO 4, Na 2 S 2 O 3, Mg(NO 3 ) 2, and UO 2 (NO 3 ), were determined in the temperature range (278 to 323) K using an electronic hygrometer with an electrolyte sensor.

TL;DR: In this article, it was shown that there is no fundamental limitation that restricts the Brunauer-Emmett-Teller (BET) model to a single electrolyte.

TL;DR: In this article, the authors measured the speed of sounduin carbon dioxide along seven isotherms at temperatures between (220 and 450) K by means of a spherical resonator.

TL;DR: In this paper, the experimental data were obtained using forced recirculation of the vapour through the liquid by means of a magnetic pump, and the experimental VLE data were regressed using the Carnahan-Starling-De Santis equation of state, which was chosen for its ability to represent the volumetric properties along bubble and dew point curves.

TL;DR: In this article, the standard enthalpies of formation Δ f H m °(cr) at T =298.15 K were determined using static-bomb calorimetry for crystalline 4-methylpyridine N-oxide (4MePyNO), 3-cyanopyridine n-oxide(3CNPyNO) and 4-cyaneopyridinitriropyridine polycyclic acid (4CO 2 HPyNO) derivatives.

TL;DR: In this article, the authors measured the excess molar enthalpies and heat capacities of two binary liquid systems with constant pressure at atmospheric pressure, using a programmable differential scanning calorimeter of the Calvet type (micro-d.s.c., from Setaram).

TL;DR: In this article, the enthalpies of the hydrated potassium and sodium borates K 2 B 4 O 7 ·4H 2 O, KB 5 O 8 ·4 H 2 O and NaB 5O 8 ·5H 2 OD in approximately 1 mol·dm −3 aqueous hydrochloric acid, as well as the enthoupies of H 3 BO 3 in HCl(aq) and of KCl and NaCl in (hydrochloric acids+boric acid) (aq) were determined.

TL;DR: In this paper, the authors measured the apparent excess speeds of sound Δ u and the isentropic compressibilities κ S for binary mixtures of n-butanol (n-C 4 H 9 OH) with n-pentane (n -C 5 H 12 ) at T =298.15 K.

TL;DR: In this article, the standard molar enthalpies of formation ΔfHm° (l or cr) at the temperatureT=298.15 K were measured using combustion calorimetry for tertbutylbenzene, 4-methyl-1-tert-butyl-benzenes, 3,5-dimethyl-1-, 1,3-di-and 1,4-tri-and tri-terto-terts-butlerbenzenes.

TL;DR: In this article, a combined experimental and modeling approach using both macroscopic thermodynamic models and molecular modeling at the density functional theory (DFT) level was used to identify possible speciation schemes in the thermodynamic modeling and provide molecular level insight into the macroscopically observed thermodynamic measurements.

TL;DR: In this article, the solubilities of four amino acids (L -cystine, L -tyrosine, l -leucine, and glycine) at T =298 K and at pH values of 000, 100, 200, 1100, 1200, and 1300 in water solutions of sodium chloride, have been measured.

TL;DR: In this article, the standard molar enthalpies of formation of the palladium sulphides were derived by measuring the heat effect associated with the formation of a low-melting (Pd+S) liquid alloy from the elements, and the effects associated with forming of the same melt from the sulphide investigated and one of the pure constituent elements.

TL;DR: In this paper, a simple model is presented from which activity and osmotic coefficients (at p sat ) can be calculated as a function of molality for T =273.15 K to T =523.15 k.

TL;DR: In this article, a vibrating-tube densimeter has been constructed for measuring the relative densities of fluid systems in the elevated temperature and pressure ranges 323≤ T /K /K≤533 and 0.1≤ p /MPa≤40.

TL;DR: In this article, the experimental results of pyrene dissolved in six binary mixtures containing 2-butanol with hexane, heptane, octane, cyclohexane, methylcyclohexanes, and 2,2,4-trimethylpentane at T =299.15 K were used to test two mathematical representations based upon the combined Nearly Ideal Binary Solvent (NIBS)/Redlich-Kister equation and Modified Wilson model.

TL;DR: In this paper, the experimental values for the refractive index n D, speed of sound u, and isentropic compressibility k S of binary mixtures of n -hexane with (1-butanol, 1-hexanol, and 1-octanol) at T =298.15 K and atmospheric pressure are presented.

TL;DR: In this paper, a simple model is presented from which activity and osmotic coefficients (atpsat) can be calculated as a function of molality for T=273.15 K to T=523.15 k.

TL;DR: In this paper, the speed of sound was measured in nitrogen on four isotherms at T /K=250, 275, 300, and 350, and at pressures between 0.1 MPa and 30 MPa.

TL;DR: In this article, density data for dilute aqueous solutions of cresols obtained in the temperature range (298.15 to 573.15) K and at either atmospheric pressure, or at pressures close to the saturated vapour pressure of water are presented along with partial molar volumes calculated from the experimental data.

TL;DR: In this article, the acid dissociation equilibria of conjugated amines with the N-bases and N-oxides were studied in propylene carbonate, a strong ionizing, polar, protophobic, aprotic solvent.

TL;DR: In this article, the temperature dependence of the refractive index at two laser line wavelengths (Ar-ion, 514 nm, and He-Ne, 632.8 nm), and the density of carbon tetrachloride, chloroform, and dichloromethane are presented at temperatures fromT=290 K toT=340 K, at atmospheric pressure.

TL;DR: In this paper, partial molar volumes at infinite dilution for free ions and ion pairs are reported for each electrolyte for the temperature range (550 to 725) K, where ionic association processes must be considered.

TL;DR: In this paper, the excess molar volumes, increments in the relative permittivity, and molar electrical susceptibility of CHCO, 2CH3+1−x CnH2n+2 have been determined from the experimentally measured densities and relative permitivities at the temperatures 298.15 K and 308.15 k.

TL;DR: In this article, data from several sources are brought together and assessed on the basis of a new type of representation, which reveals at a glance the precision of individual sets of data and also the mutual consistency of the sets taken together.