共查询到20条相似文献,搜索用时 203 毫秒
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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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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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Manuel A.V. Ribeiro da Silva Ana I.M.C. Lobo Ferreira Joana I.T.A. Cabral Ana Filipa L.O.M. Santos Ana Rita G. Moreno Tiago L.P. Galvão Inês M. Rocha Paula M.V. Fernandes Sílvia Q. Salgueiro Vanessa A.F. de Moura Isabel M.S.C. Oliveira Paula C. Cotelo Mariana R.A. Ribeiro 《The Journal of chemical thermodynamics》2009,41(9):984-991
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Essmaiil Djamali Keith Chen James W. Cobble 《The Journal of chemical thermodynamics》2009,41(9):1035-1041
Standard state thermodynamic properties for aqueous sodium perrhenate at temperature in the range of (298.15 to 598.15) K and at psat were determined by high dilution solution calorimetry down to 10?4 m. Standard state partial molar heat capacities, , of aqueous sodium perrhenate calculated from present study are compared to literature values up to T = 398.15 K. The differences between of and Cl?(aq) at lower temperature is much greater than that due to their internal molecular motions. Consequently, the perrhenate ion appears to have an ionic incomplete primary hydration shell as compared to the chloride ion. The difference in thermodynamic functions has now been well defined up to T = 598.15 K for other important high temperature calculations. 相似文献
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Manuel A.V. Ribeiro da Silva Luísa M.P.F. Amaral 《The Journal of chemical thermodynamics》2009,41(3):349-354
The standard (p° = 0.1 MPa) molar enthalpies of combustion, , for crystalline 2-furanacrylic acid, 3-furanacrylic acid, and 3-(2-furyl)-2-propenal and for the liquid 2-furanacrylonitrile were determined, at the temperature 298.15 K, using a static bomb combustion calorimeter. For these compounds, the standard molar enthalpies of phase transition, , at T = 298.15 K, were determined by Calvet microcalorimetry. For the two crystalline furanacrylic acids the vapour pressures as function of temperature were measured by the Knudsen effusion technique and the standard molar enthalpies of sublimation, , at T = 298.15 K were derived by the Clausius–Clapeyron equation. The results are as follows:
Empty Cell | |||
Calvet | Knudsen | ||
2-Furanacrylic acid (cr) | 3149.8 ± 0.5 | 103.0 ± 0.7 | 103.3 ± 0.5 |
3-Furanacrylic acid (cr) | 3151.5 ± 0.7 | 104.9 ± 1.1 | 106.8 ± 0.5 |
3-(2-Furyl)-2-propenal (cr) | 3425.7 ± 1.2 | 82.3 ± 0.4 | |
2-Furanacrylonitrile (l) | 3562.5 ± 1.3 | 65.2 ± 0.6 |