(a) KMgH3 crystallizes with a CaTiO3-type structure. Draw a diagram to show a unit cell of KMgH3. What is the coordination number of each atom?
(b) Calculate a value of ΔlatticH° (KMgH3, 298 K) given that the standard enthalpy of formation of KMgH3(s) (298 K) is -278 Id mol_1.
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