What, from the point of view of the molecular-kinetic theory, is spent on the amount of heat received by the substance during melting?

What, from the point of view of the molecular-kinetic theory, is spent on the amount of heat received by the substance during melting? Why is the amount of heat required to melt a crystalline body at the melting point in proportion to its mass?

The amount of heat goes to. destruction of the crystal lattice and an increase in the potential energy of interaction of molecules. The greater the body mass, the more energy is needed to break all bonds between molecules.

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