Explain why the boiling point of Br2 (59 degree C) is lower than that of lodine

Question

Explain why the boiling point of Br2 (59 degree C) is lower than that of lodine monochIoride, ICI (97 degree C), even though they have nearly the same molar mass. It is impossible to say without further information. The molar mass dependence of a liquid's boiling point is not an absolute rule, and it should not be applied to all compounds. ICI is polar while Br2 is nonpolar. ICI is ionic. Br2 is larger than ICI. The molar mass is not identical: the molar mass of Br2 is only 159.80 g/mol compared to 162.35 g/mol for ICI

Explanation / Answer

In ICl bonds between the Iodine and chlorine are stonger than the two Bromine atoms, so it must be polar, polar substance tend to have higher boiling points then non polar substances. mass has little to do with it, and ionic subtances are only between metals and non-metals.

The general principle is that polar substances have a higher boiling point than nonpolar ones, because polar molecules are attracted to each other via dipole-dipole interactions. There are other factors that affect boiling point, but when comparing two similar structures, you can reasonably predict that the more polar substance will have a higher boiling point

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