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Vapour pressures, enthalpies and entropies of sublimation of para substituted benzoic acids

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Abstract

The vapour pressures of six para-substituted benzoic acids were measured using the Knudsen effusion method within the pressure range (0.1–1 Pa) in the following temperature intervals: 4-hydroxybenzoic acid (365.09–387.28) K; 4-cyanobenzoic acid (355.14–373.28) K; 4-(methylamino)benzoic acid (359.12–381.29) K; 4-(dimethylamino)benzoic acid (369.29–391.01) K; 4-(acetylamino)benzoic acid (423.10–443.12) K; 4-acetoxybenzoic acid (351.28–373.27) K. From the temperature dependence of the vapour pressure, the standard molar enthalpy, entropy and Gibbs energy of sublimation, at the temperature 298.15 K, were derived for each of the studied compounds using estimated values of the heat capacity differences between the gaseous and the crystalline phases. Equations for estimating the vapour pressure of para substituted benzoic acids at the temperature of 298.15 K are proposed.

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Acknowledgements

Thanks are due to Fundação para a Ciência e Tecnologia (FCT) Lisbon, Portugal, for financial support given to Centro de Investigação em Química of University of Porto and to the Project POCTI/QUI/43144/2001 which was also financed through FEDER.

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Authors and Affiliations

  1. Department of Chemistry, Faculty of Science, Centro de Investigação em Química, University of Porto, Rua do Campo Alegre, 687, 4169-007, Porto, Portugal

    Manuel J. S. Monte, Luís M. N. B. F. Santos, José M. S. Fonseca & Carlos A. D. Sousa

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  1. Manuel J. S. Monte
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  2. Luís M. N. B. F. Santos
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  3. José M. S. Fonseca
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  4. Carlos A. D. Sousa
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Correspondence to Manuel J. S. Monte.

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Monte, M.J.S., Santos, L.M.N.B.F., Fonseca, J.M.S. et al. Vapour pressures, enthalpies and entropies of sublimation of para substituted benzoic acids. J Therm Anal Calorim 100, 465–474 (2010). https://doi.org/10.1007/s10973-009-0649-4

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  • DOI: https://doi.org/10.1007/s10973-009-0649-4

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