Termodinamica da interação do cloreto de zinco com N, N-dimetilacetamida em 1,2-dicloroetano
|
Descargar SCORM
Este recurso ha sido solicitado 1 veces (0 veces en los últimos 31 días).
Para poder solicitar este recurso debe identificarse como usuario de la biblioteca
|
| |
Ver
Detalles del recurso
|
|
|
Termodinamica da interação do cloreto de zinco com N, N-dimetilacetamida em 1,2-dicloroetano
|
| Id. |
10408496 |
| Idioma |
portugués
|
| Titulo |
Termodinamica da interação do cloreto de zinco com N, N-dimetilacetamida em 1,2-dicloroetano |
| Autor(es) |
Geraldo Leite Rolim
|
| Localización |
http://libdigi.unicamp.br/document/?code=vtls000052001
|
| Versión |
1.0 |
| Estado |
Final
|
| Descripción |
The "mean metal-oxygen bond dissociation enthalpy" D(MO) in MX2.nL adducts (M=Zn, Cd, Hg; X=Cl, Br, I; n=1, 2 or 3; L=organic base with CO or PC group) were determined by means of the extra-thermodinamic relationship, DSubH(adduct)=DcdH(L). In order to re-evaluate the data obtained, it was carried out experimental determinations, by calorimetric techniques, the enthalpies changes, DHm (298 K, 1 bar), in the process: A(cd) +ooDCE(1) = A(sln); DHm Where A=ZnCL2(s) , DMA(1), and ZnCl2.2DMA(s); DCE=1,2-dicloroethane; DMA=N,N-dimethylacetamide; oo=large amount of the solvent relative to the solute. Also the ZnC12(s) solubility in DCE at the same temperature (by equilibrium, extration, titration) was determined. Data were thermodynamically consistent. DHm was calculated for the reactions: ZnCl2(sln) + nDMA(sln) = ZnCl2.nDMA(sln); DHm in DCE solution and the values -(26.3±1,0) and (11.7±6.8) kJ.mol were obtained for n=2 and n=1, respectivelly. With these data, and those from literature, as well as, "enthalpy of formation of a cavity in the solvet", the another extra-thermodynamic relationship DintH(adduct)=DintH(L) (int=interaction solute-solvent)", it was calculated: DSubH(ZnCl2.2DMA,s)=(40±7) kJ.mol , D(ZnO, ZnCl2.2DMA)=(142±4) kJ.mol- and D(ZnO, ZnCl2.DMA)=(191±10) kJ.mol. The above results are comparable to those obtained 45,6, (139±8) and (201±7) kJ.mol, respectivelly, which were based on the extra- thermodynamic relationship already mentioned.
|
| Palabras clave |
Termodinamica
|
| Tipo de Interactividad |
Expositivo
|
| Nivel de Interactividad |
muy bajo
|
| Audiencia |
Estudiante
Profesor
Autor
|
| Estructura |
Atomic |
| Coste |
no
|
| Copyright |
sí
|
| Requerimientos técnicos |
Browser: Any
|
| Fecha de contribución |
17-oct-2009 |
| Contacto |
|
|
|
|
|
Valoración de los usuarios
No hay ninguna valoración para este recurso. Sea el primero en
valorar este recurso.
|
|
|
|
