Difference in energy needed for the different phases

[Diana Chavez-Carrillo 2L]

Why does it take more energy to vaporize (liquid to gas) than to melt/fusion (solid to liquid)? Does it have to do with their intermolecular forces?

[Jacey Yang 1F]

It requires much more energy to completely break the hydrogen bonding in water molecules to convert to the gas phase.

[Adam Kramer 1A]

Yes, it requires much more energy to completely separate the molecules (vaporizing) than to just separate slightly, as with melting a substance. The molecules are much further apart, so there must be more energy to separate these molecules greater than the energy to melt the solid.

[CalvinTNguyen2D]

Vaporization requires significantly more energy to completely break the hydrogen bonds between the H2O molecules, rather than just slightly mobilising the water molecules by melting it from solid to liquid.