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The authors describe the differential enthalpies of solution of RbBr in water at 298.15{Kappa} measured in the molality range 0.1-5.0 mol kg/sup -1/. The experimental system was a Tian-Calvet calorimeter type adapted to this particular case and tested in previous works. From the experimental results the molality dependence of the relative apparent molar enthalpy Lphi (m) has been obtained up to 5.0 mol kg/sup -1/.

Using the calorimeter and procedure described in a previous work, the authors' measured the enthalpy of solution of RbBr in water at 298.15 K in the molality range from 0.006 to 0.072 mol Kg/sup -1/. The results and the available data in the literature have been analyzed by two methods. As a result, the proposed value for the enthalpy of solution at infinite dilution is ..delta..H/sub s/infinity(298.15 K) = (22 179 +. 28) J mol/sup -1/.