Abstract :
The standard molar enthalpies of dissolution of {ZnSO4·7H2O(s) + Val(s)}, {ZnSO4·7H2O(s) + Met(s)}, Zn(Val)SO4·H2O(s) and Zn(Met)SO4·H2O(s) (where Val is l-α-valine and Met is l-α-methionine) in 2 mol dm−3 HCl at T = 298.15 ± 0.001 K have been measured to be image, image, image, image, respectively. The derived molar enthalpies of formation of the complexes Zn(Val)SO4·H2O(s) and Zn(Met)SO4·H2O(s) are image and image