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Calculated Energies of Hydrogen Bonds

B3LYP/6-31+G**

Dimer H Donor H Acceptor comment
HCOOHH2O Formic acid water dimer HCOOH Formic acid H2O Water

Energy components

Dimer Donor Acceptor difference
Energy (hartrees) -266.226691 -189.767944 -76.434049 0.024698 64.8  kJ mol-1
Vibrational zero point energy (cm-1) 12523 7071 4505 -947 -11.3  kJ mol-1
Total         53.5  kJ mol-1