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|Type:||Artigo de periódico|
|Title:||Estimative by DSC data of the sublimation enthalpies for ethyleneurea and propyleneurea: Some empirical correlations with amides and tioamides.|
|Author:||de Farias, RF|
|Abstract:||By using DSC data, the enthaplies of sublimation for ethyleneurea and propyleneurea, are calculated as 84 and 89 kJ mol(-1) respectively. Using the vaporization enthalpy values for dimethylethyleneurea and dimethylprophyleneurea, as obtained from literature, the empirical relation: Delta(cr)(g) H-m(o) (1)/ Delta(cr)(g) H-m(o) (2) = Delta(l)(g) H-m(o) (1)/ Delta(l)(g) H-m(o) (2) = constant, that relate sublimation or vaporization enthalpies of two different substances and of its methylated derivatives, is obtained. Correlations like that are found to another ureas and thioureas.|
|Editor:||Soc Brasileira Quimica|
|Citation:||Quimica Nova. Soc Brasileira Quimica, v. 22, n. 4, n. 509, n. 511, 1999.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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