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The dissociation energy is a measure of the strength of a bond. Stronger IMF's such as hydrogen bonding have a higher dissociation energy because it takes more energy to break a strong bond. Weaker IMF's like London forces have a lower dissociation energy.
Bond lengths can help describe how strong a bond is between two atoms. The shorter the bond, the stronger it is. This is why double bonds are shorter than single. Dissociation energy is related because it is the energy it takes to break the bond between two atoms. If the bond length is shorter, the dissociation energy will be higher. If the bond length is longer, the dissociation energy will be lower as it will take less energy to break a weaker (signified by longer) bond.
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