The ions H2 + and H3 + have been observed in gas discharges.
a. H2 + has been reported to have a bond distance of 106 pm and a bond dissociation enthalpy of 255 kJ mol-1 . comparable values for the neutral molecule are 74.2 pm and 436 kJ mol-1. Are these values for H2 + in agreement with the molecular orbital picture of this ion? Explain.
b. Assuming H3 + to be triangular (the probable geometry), describe the molecular orbitals of this ion and determine the expected H–H bond order.
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