The industrial manufacture of NH3 from N2 and H2 is carried out on a huge scale using heterogeneous catalysis, i.e. the reaction between gaseous N2 and H2 is carried out over a solid catalyst,
(a) Construct an MO diagram for N2 and use the diagram to explain why N2 is a chemically inert species,
(b) To what point group does NH3 belong?
(c) Using the appropriate character table in Appendix 3, construct a set of ligand group orbitals for a triangular H3- fragment. Give symmetry labels to the LGOs. Construct an MO diagram for NH3 showing the interactions between the N atomic orbitals and the LGOs of the H3-fragment. Use the MO diagram to determine the N-H bond order and to confirm that NH3 is diamagnetic
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