Abstract: | DyI2 and Dy3I were synthesized by literature techniques. Their enthalpies of solution were determined and their enthalpies of formation calculated to be ΔfH°(DyI2, s, 298 K) = ?(394 ± 16) kJ· mol?1 and ΔfH°(DyI3, s, 298 K) = ?(616 ± 10) kJ· mol?1. With appropriate literature and estimated enthalpies of solution and standard entropies, the E°(Dy3+/Dy2+, aq) was calculated to be ?(2.6 ± 0.2) V. A comparison is made of the enthalpies of reduction of DyI3 to DyI2 and of DyCl3 to DyCl2. |