ABSTRACT

The standard (p = 0.1 MPa) molar enthalpies of formation, at T = 298.15 K, for the liquids 2-methoxypyridine, 4-methoxypyridine and 2,6-dimethoxypyridine were determined by static bomb combustion calorimetry. The standard molar enthalpies of vaporization, at T = 298.15 K, were measured by Calvet microcalorimetry. The standard (p = 0.1 MPa) molar enthalpies of formation of the three compounds studied, in the gaseous phase, at T = 298.15 K have been derived from the corresponding standard molar enthalpies of formation in the liquid phase and the standard molar enthalpies of vaporization, yielding (( 42.7 +- 1.9), ( 18.2 +- 1.8) and ( 233.5 +- 1.8)) kJ mol-1, for 2-methoxypyridine, 4-methoxypyridine and 2,6-dimethoxypyridine, respectively.

Compounds

#	Formula	Name
1	CO2	carbon dioxide
2	N2	nitrogen
3	H2O	water
4	O2	oxygen
5	C6H7NO	2-methoxypyridine
6	C6H7NO	4-methoxypyridine
7	C7H9NO2	2,6-dimethoxypyridine

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	Molar enthalpy of vaporization or sublimation, kJ/mol ; Liquid	Temperature, K; Liquid	Liquid Gas	Static calorimetry	1
POMD	5	Molar enthalpy, kJ/mol ; Gas	Temperature, K; Gas Pressure, kPa; Gas	Gas	Drop calorimetry	1
POMD	6	Molar enthalpy of vaporization or sublimation, kJ/mol ; Liquid	Temperature, K; Liquid	Liquid Gas	Static calorimetry	1
POMD	6	Molar enthalpy, kJ/mol ; Gas	Temperature, K; Gas Pressure, kPa; Gas	Gas	Drop calorimetry	1
POMD	7	Molar enthalpy of vaporization or sublimation, kJ/mol ; Liquid	Temperature, K; Liquid	Liquid Gas	Static calorimetry	1
POMD	7	Molar enthalpy, kJ/mol ; Gas	Temperature, K; Gas Pressure, kPa; Gas	Gas	Drop calorimetry	1
RXND	5 1 2 3 4	Specific internal energy of reaction at constant volume, J/g			Static bomb calorimetry	1
RXND	6 1 2 3 4	Specific internal energy of reaction at constant volume, J/g			Static bomb calorimetry	1
RXND	7 1 2 3 4	Specific internal energy of reaction at constant volume, J/g			Static bomb calorimetry	1

Thermodynamics Research Center / ThermoML | Journal of Chemical Thermodynamics

Thermochemistry of some methoxypyridines

Amaral, L. M. P. F.[Luisa M. P. F.], Ribeiro de Silva, M. A. V.[Manuel. A. V.]

ABSTRACT