Home Physical Sciences Calorimetrie an Lanthantrihalogeniden und Ammoniumlanthanhalogeniden / Calorimetry of Lanthanum Trihalides and of Ammonium Lanthanum Halides
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Calorimetrie an Lanthantrihalogeniden und Ammoniumlanthanhalogeniden / Calorimetry of Lanthanum Trihalides and of Ammonium Lanthanum Halides

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Published/Copyright: June 2, 2014
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Zeitschrift für Naturforschung B
From the journal Zeitschrift für Naturforschung B Volume 52 Issue 9

By determination of the enthalpies of solution of lanthanum oxide and of lanthanum trihalides in 4n HX we derived the enthalpies of formation of the trihalides at 298 K using tabulated data. On the basis of these data and measured enthalpies of solution in 4n HX of diammonium lanthanum pentahalides, the enthalpies of formation of (NH4)2LaX5 were obtained.

ΔH°B(LaCl3,f,298) = -258,5 ± 0,8 kcal/mol; ΔH°B((NH4)2LaCl5,f,298) = -411,5 ± 1,4 kcal/mol;

ΔH°B(LaBr3,f,298) = -218,7 ± 1,7 kcal/mol; ΔH°B((NH4)2LaBr5,f,298) = -352,8 ± 2,5 kcal/mol;

ΔH°B(LaI3,f,298) = -166,9 ± 2,0 kcal/mol; ΔH°B((NH4)2LaI5,f,298) = -264,7 ± 3,0 kcal/mol.

Keywords: Lanthanum Trihalides; Ammonium Lanthanum Halides; Enthalpy of Solution; Enthalpy of Formation
Received: 1997-6-2
Published Online: 2014-6-2
Published in Print: 1997-9-1

© 1946 – 2014: Verlag der Zeitschrift für Naturforschung

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  2. Darstellung und Kristallstrukturanalyse von K3BiO3 und Rb3BiO3 / Synthesis and Crystal Structure Determination of K3BiO3 and Rb3BiO3
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https://doi.org/10.1515/znb-1997-0908
Keywords for this article
Lanthanum Trihalides; Ammonium Lanthanum Halides; Enthalpy of Solution; Enthalpy of Formation

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