Thermochemical Study on the Reaction of Lanthanum Nitrate with Alanine

The standard molar reaction enthalpy of the solid-solid coordination reaction, La(NO3)3 [Closed Circle] 6H2O (s) + 4Ala(s)(Ala is Alanine) = La(NO3)3 [Closed Circle] (Ala)4 [Closed Circle] H2O(s) + 5H2O(l), has been studied by the classical solution calorimetry. 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 quantities, the standard molar formation enthalpies of [La(NO3)3 [Closed Circle] (Ala)4 [Closed Circle] H2O, s, 298. 15 K] have been determined to be ΔlH [circled minus] m[La(NO3)3 [Closed Circle] (Ala)4 [Closed Circle] H2O, s, 298. 15 K] = -3 864.247 kJ/mol.