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Standard molar enthalpies of formation of three branched alkyl carboxylic acids

✍ Scribed by Manuel A.V. Ribeiro da Silva; M.L.C.C.H. Ferrão; Adelina M.R.O. Alves da Silva

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

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✦ Synopsis

The standard ( p o = 0.1 MPa) molar enthalpies of combustion in oxygen at T = 298.15 K of three branched alkyl chain carboxylic acids, 2-methylpropanoic, 2,2-dimethylpropanoic, and 3-methylbutanoic, were measured by static bomb combustion calorimetry, from which their standard molar enthalpies of formation were derived. Name and abbreviation c H o m /(kJ • mol -1 ) 2-Methylpropanoic acid (2-MeProp) 2185.29 ± 0.83 2,2-Dimethylpropanoic acid (2,2-diMeProp) 2828.76 ± 0.90 3-Methylbutanoic acid (3-MeBut) 2833.51 ± 0.62

The standard molar enthalpies of formation at T = 298.15 K of the gaseous carboxylic acids were derived using literature values of their standard molar enthalpies of sublimation or vaporization.

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