Thermodynamics Research Center / ThermoML | Journal of Chemical Thermodynamics

Experimental thermochemical study of three monosubstituted pyrazines

Ribeiro da Silva, M. D. M. C.[Maria D. M. C.], Miranda, M. S.[Margarida S.], Vaz, C. M. V.[Claudia M.V.], Matos, M. A. R.[M. Agostinha R.], Acree, Jr., W. E.[William E.]
J. Chem. Thermodyn. 2005, 37, 1, 49-53
ABSTRACT
The standard (p0 = 0.1 MPa) molar enthalpies of formation of liquid pyrazinecarbonitrile and of crystalline pyrazinecarboxylic acid and pyrazinamide were measured, at T = 298.15 K, by static bomb calorimetry and the standard molar enthalpies of vaporization or of sublimation, at T = 298.15 K, were obtained using Calvet microcalorimetry. These values were used to derive the respective standard molar enthalpies of formation in gaseous phase.
Compounds
# Formula Name
1 CO2 carbon dioxide
2 N2 nitrogen
3 H2O water
4 O2 oxygen
5 C5H4N2O2 2-pyrazinecarboxylic acid
6 C5H5N3O pyrazinecarboxamide
7 C5H3N3 2-cyanopyrazine
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 Constraint Phase Method #Points
  • POMD
  • 5
  • Mass density, kg/m3 ; Crystal
  • Temperature, K; Crystal
  • Pressure, kPa; Crystal
  • Crystal
  • OTHER
  • 1
  • POMD
  • 5
  • Molar enthalpy, kJ/mol ; Gas
  • Temperature, K; Gas
  • Pressure, kPa; Gas
  • Gas
  • vacuum sublimation
  • 1
  • POMD
  • 6
  • Mass density, kg/m3 ; Crystal
  • Temperature, K; Crystal
  • Pressure, kPa; Crystal
  • Crystal
  • OTHER
  • 1
  • POMD
  • 6
  • Molar enthalpy, kJ/mol ; Gas
  • Temperature, K; Gas
  • Pressure, kPa; Gas
  • Gas
  • vacuum sublimation
  • 1
  • POMD
  • 7
  • Molar enthalpy, kJ/mol ; Gas
  • Temperature, K; Gas
  • Pressure, kPa; Gas
  • Gas
  • vacuum sublimation
  • 1
  • RXND
  • 5
  • 1
  • 2
  • 3
  • 4
  • Specific internal energy of reaction at constant volume, J/g
  • BOMBST:Method:BOMBST
  • 1
  • RXND
  • 6
  • 1
  • 2
  • 3
  • 4
  • Specific internal energy of reaction at constant volume, J/g
  • BOMBST:Method:BOMBST
  • 1
  • RXND
  • 7
  • 1
  • 2
  • 3
  • 4
  • Specific internal energy of reaction at constant volume, J/g
  • BOMBST:Method:BOMBST
  • 1