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Calculated Energies of Hydrogen Bonds

MP2/CEP-121G*

Dimer H Donor H Acceptor comment
H2OHCOOH Water formic acid dimer 2 H2O Water HCOOH Formic acid to O=C

Energy components

Dimer Donor Acceptor difference
Energy (hartrees) -55.606339 -17.047937 -38.539757 0.018644 49.0  kJ mol-1
Vibrational zero point energy (cm-1) 12178 4488 6971 -720 -8.6  kJ mol-1
Total         40.3  kJ mol-1