Question
Fri December 28, 2012 By:
 

what is the energy of van der waals force and hydrogen bond? which one is stronger?

Expert Reply
Fri December 28, 2012
H-boding is a type of van der waals force. Van der waals are forces that attract molecules together (attractions between molecule and molecule) and are relatively weak. H-boding is the strongest type of van der waals which is due to the polar bonding between the hydrogen and oxygen atom (H becomes partially positive, O becomes partially negative, thus molecules end up attracted to one another in a weak force). There are other types of van der waals forces such as London Dispersion and Dipole-Dipole.
Energies associated with van der Waals interactions are quite small. Usually, they are about 2 to 4 kJ/mol per atom pair.
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