ABSTRACT

The standard (p = 0.1 MPa) molar enthalpies of formation, in the crystalline state, of the three thiophenecarboxylic acid derivatives, at T = 298.15 K, were derived from the standard massic energies of combustion, measured by rotating-bomb combustion calorimetry. The Knudsen mass loss effusion method was applied to determine the temperature vapour pressure dependence, from which the standard molar enthalpies of sublimation, at T = 298.15 K, were derived by fitting data to the Clausius Clapeyron equation.

Compounds

#	Formula	Name
1	H2O4S	sulfuric acid
2	CO2	carbon dioxide
3	H2O	water
4	O2	oxygen
5	C6H6O2S	3-methyl-2-thiophenecarboxylic acid
6	C7H6O3S	5-acetyl-2-thiophenecarboxylic acid
7	C6H6O2S	5-methyl-2-thiophenecarboxylic acid

Datasets

The table above is generated from the ThermoML associated json file (link above). POMD and RXND refer to PureOrMixture and Reaction Datasets. The compound numbers are included in properties, variables, and phases, if specificied; the numbers refer to the table of compounds on the left.
Type	Compound-#	Property	Variable	Phase	Method	#Points
POMD	5	Vapor or sublimation pressure, kPa ; Liquid	Temperature, K; Liquid	Liquid Gas	Calculated from knudsen effusion weight loss	36
POMD	6	Vapor or sublimation pressure, kPa ; Liquid	Temperature, K; Liquid	Liquid Gas	Calculated from knudsen effusion weight loss	36
POMD	7	Vapor or sublimation pressure, kPa ; Liquid	Temperature, K; Liquid	Liquid Gas	Calculated from knudsen effusion weight loss	36
RXND	7 1 2 3 4	Specific internal energy of reaction at constant volume, J/g			Rotating bomb calorimetry	1
RXND	6 1 2 3 4	Specific internal energy of reaction at constant volume, J/g			Rotating bomb calorimetry	1
RXND	1 5 2 3 4	Specific internal energy of reaction at constant volume, J/g			Rotating bomb calorimetry	1

Thermodynamics Research Center / ThermoML | Journal of Chemical Thermodynamics

Thermochemical properties of three 2-thiophenecarboxylic acid derivatives

Ribeiro da Silva, M. A. V.[Manuel A. V.], Santos, A. F. L. O. M.[Ana Filipa L.O.M.]

ABSTRACT