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Excess molar heat capacities and excess molar volumes of (ann-alkylalkanoate  +  2,2,4-trimethylpentane, or 2,2,4,4,6,8,8-heptamethylnonane) atT =  298.15 K

✍ Scribed by M. Pintos-Barral; R. Bravo; G. Roux-Desgranges; J.-P.E. Grolier; Emmerich Wilhelm

Publisher
Elsevier Science
Year
1999
Tongue
English
Weight
213 KB
Volume
31
Category
Article
ISSN
0021-9614

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✦ Synopsis

Excess molar heat capacities C E

p,m at constant pressure have been measured, as a function of mole fraction x at the temperature T = 298.15 K and atmospheric pressure, for eight liquid mixtures consisting of an n-alkylalkanoate and a highlybranched alkane {i.e. 2,2,4-trimethylpentane (isooctane) and 2,2,4,4,6,8,8-heptamethyl-nonane}: [xHCOO(CH 2

Excess molar volumes V E m have been determined, as a function of mole fraction x at the same temperature and pressure, for the same eight mixtures. The instruments used were a Picker flow microcalorimeter and a vibrating-tube densimeter, respectively. All the mixtures show positive excess volumes with a more or less parabolic composition dependence, with the maximum values of V E m ranging between c. 0.3 cm 3 β€’ mol -1 and 0.9 cm 3 β€’ mol -1 . Most of the C E p,m against x curves show a pronounced W-shape. However, for {xCH 3 CH 2 COO(CH 2 ) 2 CH 3 + (1 -x)(CH 3 ) 3 CCH 2 CH(CH 3 ) 2 }, the C E p,m curve has degenerated to one with a virtually flat portion extending from about x = 0.2 to x = 0.8, and

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