Abstract
Low-temperature heat capacities of the complex Zn(Thr)SO 4·H 2O (s) have been precisely measured with a small sample adiabatic calorimeter over the temperature range from 78 to 373 K. The initial dehydration temperature of the complex ( T d=325.50 K) has been obtained by analysis of the heat-capacity curve. The experimental values of molar heat capacities have been fitted to a polynomial equation by least square method. The standard molar enthalpy of formation of the complex has been determined from the enthalpies of dissolution (Δ d H m Θ ) of [ZnSO 4·7H 2O (s) +Thr (s)] and Zn(Thr)SO 4·H 2O (s) in 100 ml of 2 mol dm −3 HCl solvent as: Δ f H m,Zn(Thr)SO 4·H 2O Θ =−2111.7±3.4 kJ mol −1. These experiments were made by using an isoperibol solution calorimeter at 298.15 K.
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