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Standard enthalpy of formation of metal (K, Ba, Li, Ca, Gd, Pb, Cu And Zn) salts of NTO

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Abstract

From measurements of the enthalpy of solution of metal salts of 3-nitro-1,2,4-triazol-5-one (NTO) in water, the standard enthalpies of formation of KNTO·H2O, Ba(NTO)2·3H2O, LiNTO·2H2O, Ca(NTO)2·4H2O and Gd(NTO)3·7H2O were determined as −(676.9±2.6), −(1627.0±2.5), −(966.6.3±2.2), −(1905.5±4.4) and −(3020.1±6.4) kJ·mol−1, respectively. From measurements of the enthalpy of precipitation of KNTO·H2O crystal with Pb(NO3)2(aq), CuSO4(aq) and Zn(NO3)2(aq), the standard enthalpies of formation of Pb(NTO)2·H2O, Cu(NTO)2·2H2O and Zn(NTO)2·H2O were determined as −(247.4±5.9), −(712.1±5.4) and −(628.8±5.7) kJ·mol−1, respectively.

Zusammenfassung

Ausgehend von den Lösungsenthalpien der Metallsalze von 3-Nitro-1,2,4-Triazol-5-on (NTO) in Wasser wurden die Standard-Bildungsenthalpien von KNTO·H2O, Ba(NTO)2·3H2O, LiNTO·2H2O, Ca(NTO)2·4H2O und Gd(NTO)3·7H2O mit −(676.9±2.6), −(1627.0±2.5), −(966.6±2.2), −(1905.5±4.4) und −(3020.1±6.4) kJ/mol ermittelt. Aus Messungen der Präzipitationsenthalpie von KNTO·H2O-Kristallen mit Pb(NO3)2(aq), CuSO4(aq) und Zn(NO3)2(aq) wurden die Standard-Bildungsenthalpien von Pb(NTO)2·H2O, Cu(NTO)2·2H2O und von Zn(NTO)2·H2O mit −(247.4±5.9), −(712.1±5.4) und mit −(628.8±5.7) kJ/mol ermittelt.

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Authors and Affiliations

  1. Xian Modern Chemistry Research Institute, 710061, Xian Shaanxi, P. R. China

    Zihui Meng & Rongzu Hu

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  1. Zihui Meng
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  2. Rongzu Hu
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Meng, Z., Hu, R. Standard enthalpy of formation of metal (K, Ba, Li, Ca, Gd, Pb, Cu And Zn) salts of NTO. Journal of Thermal Analysis 45, 79–86 (1995). https://doi.org/10.1007/BF02548666

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