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Calculated Energies of Hydrogen Bonds

B3LYP/6-31+G**

Dimer H Donor H Acceptor comment
H2OH2CO water formaldehyde dimer H2O Water H2CO Formaldehyde

Energy components

Dimer Donor Acceptor difference
Energy (hartrees) -190.953676 -76.434049 -114.511525 0.008102 21.3  kJ mol-1
Vibrational zero point energy (cm-1) 10801 4505 5643 -653 -7.8  kJ mol-1
Total         13.5  kJ mol-1