A Thermochemical Study of the Reaction of Lanthanum Nitrate with Alanine

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The standard molar reaction enthalpy of the solid-solid coordination reaction La(NO3)3 ·6H2O (s) +4Ala(s) (Ala is Alanine)=La(NO3)3 · (Ala)4 · H2O(s) + 5H2O(1) was studied byusing classical solution calorimetry. The molar dissolution enthalpies of the reactants and theproduct of the solid-solid coordination reaction in 2 mol/L HCl were measured by using anisoperibol calorimeter. From the results and other auxiliary quantities, the standard molar formation enthalpy of [La (NO3)3 · (Ala)4 · H2O, s, 298. 15 K] has been determined to be△fHm [La(NO3)3 · (Ala)4 · H2O, s, 298. 15 K]=-3 864. 248 kJ/mol.
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