Thermochemical study on the reaction of lanthanum nitrate with alanine

The standard molar reaction enthalpy of the solid-solid coordination reacti on, La(NO3)(3) . 6H(2)O (s) + 4Ala(s) (Ala is Alanine) = La (NO3)(3) . (Ala )(4) . H2O(s) + 5H(2)O(1), has been studied by the classical solution calor imetry. The molar dissolution enthalpies of the reactants and the products in 2 mol/L HCl of this solid-solid coordination reaction have been measured by using an isoperibol calorimeter. From the results and other auxiliary q uantities, the standard molar formation enthalpies of [La(NO,)3 (Ala), H2O, s, 298. 15 K] have been determined to be Delta(1)H(m)(circle minus)[La(NO3 )(3) . (Ala)(4) . H2O, s, 298. 15 K] = -3 864. 247 kJ/mol.