Thermodynamic properties of mixed valency compounds III. Standard enthalpies of formation, Gibbs free energies of formation, and stabilities of Cs2SbBr6 and Cs2SbBr5

1975 ◽  
Vol 7 (1) ◽  
pp. 33-40 ◽  
Author(s):  
Susan H. Lee ◽  
Robert M. Murphy ◽  
Claus A. Wulff
Keyword(s):  
Thermodynamic Properties ◽  
Enthalpies Of Formation ◽  
Free Energies ◽  
Mixed Valency ◽  
Standard Enthalpies Of Formation

Calorimetric study of the digestion of gibbsite, Al(OH)3(cr), and thermodynamics of aqueous aluminate ion, Al(OH)4−(aq)

1991 ◽  
Vol 69 (11) ◽  
pp. 1685-1690 ◽  
Author(s):  
Qiyuan Chen ◽  
Yuming Xu ◽  
Loren G. Hepler
Keyword(s):  
Thermodynamic Properties ◽  
Aqueous Sodium Hydroxide ◽  
Sodium Aluminate ◽  
Heat Capacities ◽  
Enthalpies Of Formation ◽  
Calorimetric Study ◽  
Enthalpies Of Solution ◽  
Calorimetric Measurements ◽  
Wide Range ◽  
Standard Enthalpies Of Formation

We have made calorimetric measurements of the enthalpies of solution of gibbsite, Al(OH)3(cr), in aqueous sodium hydroxide solutions at five temperatures from 100 to 150 °C. Results of these measurements have been used to obtain the standard enthalpies of formation of Na+(aq) + Al(OH)4−(aq) at the experimental temperatures. These results have also led to values of ΔCp0 for the reaction represented concisely by Al(OH)3(cr) + OH−(aq) = Al(OH)4−(aq), from which we have obtained standard state partial molar heat capacities of Na+(aq) + Al(OH)4−(aq). Combination of our results with those from earlier investigations has permitted calculation of thermodynamic properties of Na+(aq) + Al(OH)4−(aq) over a wide range of temperature and thence some generalizations about the usefulness of various equations for representing or predicting these thermodynamic properties. Key words: gibbsite, enthalpy of solution; sodium aluminate (aqueous), thermodynamic properties; heat capacities, Na+(aq) + Al(OH)4−(aq).

Theoretical study on thermochemical parameters and IR spectra of chlorinated isomers of nitrobenzene

2013 ◽  
Vol 91 (10) ◽  
pp. 999-1008 ◽  
Author(s):  
Ibrahem Altarawneh ◽  
Mohammednoor Altarawneh ◽  
Saleh Rawadieh
Keyword(s):  
Experimental Data ◽  
Heat Capacity ◽  
Ir Spectra ◽  
Theoretical Study ◽  
Enthalpies Of Formation ◽  
Geometrical Parameters ◽  
Free Energies ◽  
Calculated Enthalpy ◽  
Standard Enthalpies Of Formation ◽  
Thermochemical Parameters

Thermochemical and geometrical parameters and internal rotation barriers of all chlorinated nitrobenzene isomers were calculated with the G3MP2B3 composite method. Standard entropies, standard Gibbs free energies of formation, standard enthalpies of formation, and heat capacities were calculated and compared with their corresponding available experimental data. Our calculated enthalpy values agree well with the corresponding experimental data. The temperature dependence of entropy and heat capacity has been analysed. All isomers with ortho-chlorine substituents were found to be less stable than other corresponding isomers. Rotational barriers and distortions of the benzene rings were incorporated in the calculations of values for entropy and heat capacity. The IR spectra were calculated and found to be in reasonable agreement with the experimental spectra.

Standard enthalpies of formation of N,N´-(1,3-phenylene)bis(phthalimide) and N,N´-(1,3-phenylene)bis(phthalimide-5-carboxilic acid)

2021 ◽  
pp. 178861
Author(s):  
Karina Salas-López ◽  
Miguel A. García-Castro ◽  
Patricia Amador ◽  
Ana M. Herrera-González ◽  
Alberto Galicia-Aguilar ◽  
...  
Keyword(s):  
Enthalpies Of Formation ◽  
Standard Enthalpies Of Formation
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