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Joseph Saba wrote:Determine it by the intermolecular forces of the molecules as compared with another.
And the stronger the IM forces, the higher the melting and boiling points are because the forces are harder to break to switch in to different phases.
Molecules with a higher melting point would have stronger intermolecular forces. If the molecules you are comparing have the same IMF's, you would then look at the atom size. Bigger atoms would have a higher melting point because they are more polarizable, which creates greater attractive forces, making it harder to break the IMF's and thus increasing the melting point.
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