Thermodynamic study of the sublimation of six halobenzoic acids

被引：35

作者：

da Silva, MAVR ^{[1
]}

Fonseca, JMS ^{[1
]}

Carvalho, RPBM ^{[1
]}

Monte, MJS ^{[1
]}

机构：

[1] Univ Porto, Ctr Invest Quim, Fac Sci, Dept Chem, P-4169007 Oporto, Portugal

来源：

JOURNAL OF CHEMICAL THERMODYNAMICS | 2005年 / 37卷 / 03期

关键词：

Knudsen effusion; vapour pressures; enthalpies of sublimation; entropies of sublimation; enthalpies of fusion; halobenzoic acids; chlorobenzoic acids; bromobenzoic acids;

D O I：

10.1016/j.jct.2004.09.005

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

The Knudsen mass-loss effusion technique was used to measure the vapour pressures at different temperatures of the following halobenzoic acids: 2-chlorobenzoic acid, between T = (320.16 and 339.15) K, 3-chlorobenzoic acid, between T = (320.13 and 340.13) K, 4-chlorobenzoic acid, between T= (333.15 and 356.14) K, 2-bromobenzoic acid, between T= (327.56 and 347.68) K, 3-bromobenzoic acid, between T = (327.67 and 347.60) K and 4-bromobenzoic acid, between T = (348.67 and 366.65) K. From the temperature dependence of the vapour pressure of the crystalline compounds, the standard, pdegrees = 10(5) Pa, molar enthalpies, entropies and Gibbs energies of sublimation at T= 298.15 K, were derived. A d.s.c. study of the fusion of the crystals is also presented. (C) 2004 Elsevier Ltd. All rights reserved.

引用

页码：271 / 279

页数：9

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