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Calculated Energies of Hydrogen Bonds

B3LYP_cp/6-31G*

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

Energy components

Dimer Donor Acceptor difference
Energy (hartrees) -132.968618 -76.408954 -56.547948 0.011717 30.8  kJ mol-1
Vibrational zero point energy (cm-1) 12496 4462 7278 -755 -9.0  kJ mol-1
Total         21.7  kJ mol-1