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Enthalpies of vaporization of some highly branched hydrocarbons

✍ Scribed by James S. Chickos; Donald G. Hesse; Sarah Hosseini; Joel F. Liebman; G. David Mendenhall; Sergej P. Verevkin; Klaus Rakus; Hans-Dieter Beckhaus; Christoph Rüchardt

Publisher
Elsevier Science
Year
1995
Tongue
English
Weight
414 KB
Volume
27
Category
Article
ISSN
0021-9614

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✦ Synopsis

Measurements of the molar enthalpy of vaporization DvapHm at the temperature T=298.15 K are reported for 14 liquids and 6 solids each containing one or more quaternary carbon atoms, by the methods of transpiration, head-space analysis, or gas chromatography. The results are compared with literature values and with estimates based on a simple two-parameter equation developed previously for hydrocarbons. A relation between the solvent-accessible surface area A and the value of DvapHm has been observed for hydrocarbons containing quaternary centers. Measurements of the molar enthalpies of sublimation DsubHm are also reported for two more solids at T=293 K or at T=298.15 K.

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