DOI: 10.1063/1.1700280. Heat Capacity, Gas Imperfection, Infrared Spectra, and Internal Rotation Barriers of Ethyl Alcohol

Heat Capacity, Gas Imperfection, Infrared Spectra, and Internal Rotation Barriers of Ethyl Alcohol

10.1063/1.1700280

Crossref journal-article

AIP Publishing

The Journal of Chemical Physics (317)

Abstract

The vapor heat capacities of ethyl alcohol have been measured, as a function of pressure, at 368, 422, and 476°K. From the variation of the heat capacity with pressure, together with vapor densities calculated by the Clapeyron equation, an equation of state for ethyl alcohol has been obtained. This equation has been used to extrapolate the measured heat capacities to the ideal gas state and likewise to correct the observed entropy. The infrared spectra of vapor C2H5OH, C2H5OD, and liquid C2H5OD are presented and a vibrational assignment is obtained which is sufficiently reliable for the statistical calculation of the thermodynamic properties. Comparison of the observed and statistically calculated heat capacities and entropies shows that, with a barrier to internal rotation of the CH3 group of 3000 calories, the rotation of the OH group is hindered by a barrier between 0 and 1200 calories. Most satisfactory agreement is obtained for CH3 and OH barriers of 3300 and 800 calories, respectively. Furthermore, comparison of the observed and calculated equilibrium constants for the reaction C2H4(g)+H2O(g)⇌C2H5OH(g)supports the selection of fundamental frequencies and internal rotation barriers.

Bibliography

Barrow, G. M. (1952). Heat Capacity, Gas Imperfection, Infrared Spectra, and Internal Rotation Barriers of Ethyl Alcohol. The Journal of Chemical Physics, 20(11), 1739â1744.

Authors 1

Gordon M. Barrow (first)

References 26 Referenced 67

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Dates

Type	When
Created	20 years, 7 months ago (Jan. 9, 2005, 8:19 a.m.)
Deposited	1 year, 6 months ago (Feb. 8, 2024, 9:46 a.m.)
Indexed	3 months ago (May 27, 2025, 4:46 a.m.)
Issued	72 years, 9 months ago (Nov. 1, 1952)
Published	72 years, 9 months ago (Nov. 1, 1952)
Published Print	72 years, 9 months ago (Nov. 1, 1952)

Funders 0

None

BibTeX

@article{Barrow_1952, title={Heat Capacity, Gas Imperfection, Infrared Spectra, and Internal Rotation Barriers of Ethyl Alcohol}, volume={20}, ISSN={1089-7690}, url={http://dx.doi.org/10.1063/1.1700280}, DOI={10.1063/1.1700280}, number={11}, journal={The Journal of Chemical Physics}, publisher={AIP Publishing}, author={Barrow, Gordon M.}, year={1952}, month=nov, pages={1739–1744} }

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