Thermodynamic study on the sublimation of 1,2-diphenylethane and of 3-phenylpropiolic acid

The Knudsen mass-loss effusion technique was used to measure the vapour pressures at different temperatures of the following crystalline compounds: 1,2-diphenylethane (bibenzyl), between T= 289.16 K and T= 303.20 K, and of 3-phenylpropiolic acid between T= 329.15 K and T= 343.15 K. From the temperat...

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Bibliographic Details
Published in:The Journal of chemical thermodynamics 2001-08, Vol.33 (8), p.849-857
Main Authors: Monte, Manuel J.S., Hillesheim, Dorothea M.
Format: Article
Language:English
Subjects:
1,2-diphenylethane
3-phenylpropiolic acid
bibenzyl
Chemical thermodynamics
Chemistry
Elements, mineral and organic compounds
enthalpies of sublimation
entropies of sublimation
Exact sciences and technology
General and physical chemistry
standard Gibbs energies of sublimation
Thermodynamic properties
vapour pressures
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Summary:The Knudsen mass-loss effusion technique was used to measure the vapour pressures at different temperatures of the following crystalline compounds: 1,2-diphenylethane (bibenzyl), between T= 289.16 K and T= 303.20 K, and of 3-phenylpropiolic acid between T= 329.15 K and T= 343.15 K. From the temperature dependence of the vapour pressure, the standard molar enthalpies of sublimation at the mean temperature of the experimental range were derived by the Clausius–Clapeyron equation. From these results the standard, po= 105Pa, molar enthalpies, entropies, and Gibbs energies of sublimation at T= 298.15 K, were calculated:
ISSN:0021-9614
1096-3626
DOI:10.1006/jcht.2000.0761