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Calculated Energies of Hydrogen Bonds

B3LYPultrafine_cp_opt/6-31+G**

Dimer H Donor H Acceptor comment
H2ONH3 Water Ammonia Dimer H2O Water NH3 Ammonia

Energy components

Dimer Donor Acceptor difference
Energy (hartrees) -133.012003 -76.434049 -56.566985 0.010969 28.8  kJ mol-1
Vibrational zero point energy (cm-1) 12595 4498 7263 -834 -10.0  kJ mol-1
Total         18.8  kJ mol-1