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