共查询到20条相似文献,搜索用时 328 毫秒
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Ivan Cibulka Lubomír Hnědkovský Josef Šedlbauer 《The Journal of chemical thermodynamics》2010,42(2):198-207
Density data for dilute aqueous solutions of two amino acids (glycine, l-alanine) obtained using a flow vibrating-tube densimeter are presented together with partial molar volumes at infinite dilution (standard molar volumes, ) calculated from the measured data. The experiments were performed at temperatures from (298 up to 443) K at pressures close to the saturation line of water, at pressures in the range from (15 to 17) MPa, and at 30 MPa. Values of an analogue of isothermal compressibility, , are also evaluated. Maxima on the curves and are observed and discussed. The new data along with literature values of standard molar volumes and heat capacities are used for generating the recommended parameterization of an equation of state for standard molar thermodynamic properties of the aqueous amino acids. 相似文献
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《The Journal of chemical thermodynamics》2007,39(7):1077-1084
Martin’s equation, , is extended to cover vaporization free energy . The extended equation is further expanded in terms of enthalpy and entropy and then used to correlate vaporization enthalpy and enthalpy of transfer from solution to gas . Data available in the literatures are used to validate and support the speculations derived from the proposed equation. 相似文献
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Dioxygen affinities and catalytic oxidation performance of cobalt(Ⅱ) hydroxamates with benzo-15-crown-5 pendants 总被引:1,自引:0,他引:1
Hong Bo Li Chuan Qin Wen Bing Yang Xiao Ping Hu Sheng Ying Qin 《中国化学快报》2007,18(1):103-106
The oxygenation constants(Ko_2)of cobalt(Ⅱ)hydroxamates(CoL_2~1-CoL_2~3)with benzo-15-crown-5(B15C5)pendants were measured over the range of-5 to 20℃,and the values of thermodynamic parameters(ΔH~0 andΔS~0)were calculated based on these(No_2)values.Meanwhile,these crowned complexes were employed to the oxidation for p-xylene to p-toluic acid with air at 110Δunder normal atmospheric pressure.The effects of B15C5 pendant and the length of chain bonded to B15C5 in these complexes on the O_2-binding capabilities and oxidation for p-xylene were investigated with the comparison of crown-free analogues CoL_2~4. 相似文献
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《The Journal of chemical thermodynamics》2007,39(6):888-892
Calcium titanofluoride CaTiF5(s) was prepared by solid-state reaction of CaF2(s) with TiF3(s) and characterized by X-ray diffraction method. The standard molar isobaric heat capacity of CaTiF5(s) was determined by a power compensated differential scanning calorimeter in the temperature from 230 K to 710 K. A solid-state galvanic cell with CaF2 as electrolyte was used to determine the standard molar Gibbs energy of formation of CaTiF5 in the temperature range from 803 K to 1005 K. The galvanic cell can be depicted as:The second law analysis of present data were carried out to derive the standard entropy and the enthalpy of formation and the values derived are 68.7 J · K−1 · mol−1 and −2848.4 kJ · mol−1, respectively. 相似文献
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Ana Filipa L.O.M. Santos André R. Monteiro Jorge M. Gonçalves William E. Acree Maria D.M.C. Ribeiro da Silva 《The Journal of chemical thermodynamics》2011,43(7):1044-1049
In this paper, the first, second and mean (N?O) bond dissociation enthalpies (BDEs) were derived from the standard (p° = 0.1 MPa) molar enthalpies of formation, in the gaseous phase, , at T = 298.15 K, of 2,2′-dipyridil N-oxide and 2,2′-dipyridil N,N′-dioxide. These values were calculated from experimental thermodynamic parameters, namely from the standard (p° = 0.1 MPa) molar enthalpies of formation, in the crystalline phase, , at T = 298.15 K, obtained from the standard molar enthalpies of combustion, , measured by static bomb combustion calorimetry, and from the standard molar enthalpies of sublimation, at T = 298.15 K, determined from Knudsen mass-loss effusion method. 相似文献
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