Methanol: Heat Capacity, Enthalpies of Transition and Melting, and Thermodynamic Properties from 5–300°K

Autor:	Edgar F. Westrum, H. G. Carlson
Rok vydání:	1971
Předmět:	Phase transition Standard molar entropy Chemistry Enthalpy General Physics and Astronomy Thermodynamics Calorimetry Heat capacity Gibbs free energy Entropy of fusion symbols.namesake Impurity symbols Physical and Theoretical Chemistry
Zdroj:	The Journal of Chemical Physics. 54:1464-1471
ISSN:	1089-7690 0021-9606
DOI:	10.1063/1.1675039
Popis:	Thermal properties of methanol were studied by adiabatic calorimetry. The first‐order nature of the phase transition at 157.4°K with an entropy increment of 0.97 cal mole−1·°K−1 was confirmed. The heat capacity of the crystalline phase stable just below the triple point was defined and shown to be extremely sensitive to impurity. No evidence for a second previously‐reported phase transition could be detected. The standard entropy (S°) and Gibbs energy function (− [G° − H°0] / T) for the liquid at 298.15°K are 30.40 and 15.18 cal mole−1·°K−1, respectively. The proposed classification of methanol as a plastic crystal on the basis of its small entropy of melting (4.38 cal mole−1·°K−1) is considered with respect to hydrogen bonding in the liquid phase.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::c1e13ecf591fc620ac3d1945e01aa7ab https://doi.org/10.1063/1.1675039 Zobrazit plný text záznamu