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Calculated Energies of Hydrogen Bonds

B3LYP/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) -56.006999 -17.177811 -38.811832 0.017357 45.6  kJ mol-1
Vibrational zero point energy (cm-1) 12295 4523 7043 -729 -8.7  kJ mol-1
Total         36.8  kJ mol-1