Question

How is melting point related to intermolecular forces of attraction? Why is latent heat of evaporation is greater than latent heat of fusion?

Answer 1

The heat of fusion (heat required to melt a solid) and heat of vaporization (heat required to vaporize a liquid) are determined by the strength of the Intermolecular Forces. Substances with high IMF will have higher melting and boiling points. ... Most IMF are weaker than chemical bonds.

Now as you heat a solid turning it into a liquid, you increase the kinetic energy of its molecules, moving them further apart until the forces of attraction are reduced to allow it to flow freely. ... Hence the reason why the latent heat of vaporization is greater that thelatent heat of fusion.

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