Abstract

The heat of decomposition of copper hydride was measured, and this employed in a Born-Haber cycle to yield a lattice energy of 288·6 kcal/mole. Computation of the lattice energy of a hypothetical ionic Cu +H − by a Born-Landé equation resulted in 216 kcal/mole. These quantities were used to estimate the heat of transformation of hypothetical Cu +H − into real CuH; other thermochemical properties were calculated as well. These results, along with considerations of electronegativity, bond energy of CuH(g), and structure, all point to the covalent nature of copper hydride.

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