Journal of Thermal Analysis and Calorimetry
Volume/Issue:
Volume 76: Issue 3
Low-temperature heat capacities and derived thermodynamic functions of cyclohexane
Authors:
Z. Nan Qufu Normal University Qufu Department of Chemistry Shandong 273165 P. R. China Shandong 273165 P. R. China

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Z. Tan Chinese Academy of Sciences Dalian 116023 P. R. China 116023 P. R. China

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Pages:
955–963
Online Publication Date:
03 Nov 2004
Publication Date:
01 Jun 2004
Article Category:
Research Article
DOI:
https://doi.org/10.1023/b:jtan.0000032281.40952.7e
Keywords:
cyclohexane; heat capacity; adiabatic calorimetry; sample container; thermodynamic function
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Abstract  

The low-temperature heat capacities of cyclohexane were measured in the temperature range from 78 to 350 K by means of an automatic adiabatic calorimeter equipped with a new sample container adapted to measure heat capacities of liquids. The sample container was described in detail. The performance of this calorimetric apparatus was evaluated by heat capacity measurements on water. The deviations of experimental heat capacities from the corresponding smoothed values lie within 0.3%, while the inaccuracy is within 0.4%, compared with the reference data in the whole experimental temperature range. Two kinds of phase transitions were found at 186.065 and 279.684 K corresponding solid-solid and solid-liquid phase transitions, respectively. The entropy and enthalpy of the phase transition, as well as the thermodynamic functions {H(T)-H298.15 K} and {S(T)-S298.15 K}, were derived from the heat capacity data. The mass fraction purity of cyclohexane sample used in the present calorimetric study was determined to be 99.9965% by fraction melting approach.

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Cover Journal of Thermal Analysis and Calorimetry
Journal of Thermal Analysis and Calorimetry
Print ISSN:
1388-6150
Online ISSN:
1572-8943

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Journal of Thermal Analysis and Calorimetry
Language English
Size A4
Year of
Foundation		 1969
Volumes
per Year		 1
Issues
per Year		 24
Founder Akadémiai Kiadó
Founder's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher		 Chief Executive Officer, Akadémiai Kiadó
ISSN 1388-6150 (Print)
ISSN 1588-2926 (Online)

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