Water (H20) has hydrogen bonding and London forces. Hydrogen sulfide (H2S) has only London forces. The reason why water has hydrogen bonding and hydrogen sulfide does not is because the oxygen in water is more electronegative than the sulfur in hydrogen sulfide. Hydrogen bonding only occurs between molecules that have hydrogen bonded to a very electronegative atom, which is either oxygen, fluorine, or nitrogen.Think about it: a hydrogen bond is a intermolecular attraction between the hydrogen of one atom and the lone pair of electrons of another atom. In order for the bond to exist the lone pair of electrons must belong to a electronegative atom, so there will be a great tendency for attraction.H2O is very strongly hydrogen bonded. These bonds require energy to break resulting in a higher