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Thermodynamic Study of Benzamide, N-Methylbenzamide, and N,N-Dimethylbenzamide: Vapor Pressures, Phase Diagrams, and Hydrogen Bond Enthalpy

Title
Thermodynamic Study of Benzamide, N-Methylbenzamide, and N,N-Dimethylbenzamide: Vapor Pressures, Phase Diagrams, and Hydrogen Bond Enthalpy
Type
Article in International Scientific Journal
Year
2010
Authors
Almeida, ARRP
(Author)
Other
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Manuel J S Monte
(Author)
FCUP
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Journal
Vol. 55 No. 1
Pages: 3507-3512
ISSN: 0021-9568
Scientific classification
FOS: Engineering and technology > Chemical engineering
CORDIS: Physical sciences > Chemistry > Physical chemistry
Other information
Authenticus ID: P-003-3J1
Abstract (EN): A static method was used to measure the vapor pressures of crystalline and liquid phases of benzamide, N-methylbenzamide, and N,N-dimethylbenzamide, in the temperature ranges (344.8 to 438.2) K, (322.9 to 388.4) K, and (297.0 to 361.7) K, respectively. The vapor pressures of the crystalline phase of benzamide were also measured using the Knudsen effusion method in the temperature range (324.1 to 344.2) K. From the experimental results, the standard molar Gibbs energies and enthalpies of sublimation and of vaporization, at T = 298.15 K, and the triple points coordinates (p,T) for the three compounds were derived. The temperatures and molar enthalpies of fusion were also determined using differential scanning calorimetry and were compared with the values derived from the vapor pressure measurements. The results enabled the determination of the hydrogen bond enthalpies in the studied compounds.
Language: English
Type (Professor's evaluation): Scientific
Contact: mjmonte@fe.up.pt
No. of pages: 6
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