Thermodynamics Research Center / ThermoML | Journal of Chemical Thermodynamics

Standard molar enthalpies of formation of 3'- and 4'-nitroacetophenones

Ribeiro da Silva, M. A. V.[Manuel A. V.], Amaral, L. M. P. F.[Luisa M. P. F.]
J. Chem. Thermodyn. 2011, 43, 6, 876-881
ABSTRACT
The standard (p = 0.1 MPa) molar enthalpies of formation, in the condensed phase, of 3'- and 4'-nitroacetophenones, presented in this work, were obtained from measurements of their combustion energies, at T = 298.15 K, using a static bomb calorimeter. The vapor pressures of the two crystalline 3'- and 4'-nitroacetophenones were measured as a function of temperature by the Knudsen effusion mass loss technique. The standard molar enthalpies of sublimation, at T = 298.15 K, were derived from the Clausius-Clapeyron equation. The standard molar enthalpies, entropies, and Gibbs functions of sublimation, at T = 298.15 K, were calculated for the two compounds. The experimental values obtained were used to calculate the standard molar enthalpies of formation of 3'- and 4'-nitroacetophenones, in the gaseous phase, as -(99.4 +- 1.6) kJ mol-1 and -(99.1 +- 1.7) kJ mol-1, respectively, and these derived values are analyzed in terms of structural enthalpic increments.
Compounds
# Formula Name
1 CO2 carbon dioxide
2 N2 nitrogen
3 H2O water
4 O2 oxygen
5 C graphite
6 H2 hydrogen
7 C8H7NO3 1-(3-nitrophenyl)ethanone
8 C8H7NO3 1-(4-nitrophenyl)ethanone
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
  • 7
  • Molar enthalpy of vaporization or sublimation, kJ/mol ; Crystal
  • Temperature, K; Crystal
  • Crystal
  • Gas
  • Ebulliometric method (Recirculating still)
  • 1
  • POMD
  • 7
  • Vapor or sublimation pressure, kPa ; Crystal
  • Temperature, K; Crystal
  • Crystal
  • Gas
  • Calculated from knudsen effusion weight loss
  • 36
  • POMD
  • 8
  • Molar enthalpy of vaporization or sublimation, kJ/mol ; Crystal
  • Temperature, K; Crystal
  • Crystal
  • Gas
  • Ebulliometric method (Recirculating still)
  • 1
  • POMD
  • 8
  • Vapor or sublimation pressure, kPa ; Crystal
  • Temperature, K; Crystal
  • Crystal
  • Gas
  • Calculated from knudsen effusion weight loss
  • 35
  • RXND
  • 7
  • 1
  • 2
  • 3
  • 4
  • Specific internal energy of reaction at constant volume, J/g
  • Static bomb calorimetry
  • 1
  • RXND
  • 8
  • 1
  • 2
  • 3
  • 4
  • Specific internal energy of reaction at constant volume, J/g
  • Static bomb calorimetry
  • 1
  • RXND
  • 7
  • 5
  • 6
  • 2
  • 4
  • Molar enthalpy of reaction, kJ/mol
  • Static bomb calorimetry
  • 1
  • RXND
  • 7
  • 5
  • 6
  • 2
  • 4
  • Molar enthalpy of reaction, kJ/mol
  • Static bomb calorimetry
  • 1
  • RXND
  • 8
  • 5
  • 6
  • 2
  • 4
  • Molar enthalpy of reaction, kJ/mol
  • Static bomb calorimetry
  • 1
  • RXND
  • 8
  • 5
  • 6
  • 2
  • 4
  • Molar enthalpy of reaction, kJ/mol
  • Static bomb calorimetry
  • 1