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Edmund Zhi 1J wrote:Can someone please explain why AsF3 has a boiling point of 63C while AsF5 has a boiling point of -53C?
Since AsF3 has a lone pair in its structure, it has a net dipole moment and exhibits polar characteristics. Meanwhile, AsF5 has no net dipole moment and is nonpolar. Therefore, it will take more energy to overcome the bonds in AsF3 than AsF5, hence the higher boiling point of AsF3.
AsF3 has a higher boiling point than AsF5 as AsF3 is polar and thus has dipole-dipole interactions between molecules. AsF5 on the other hand, is non-polar and thus only has weak London Forces. Due to the stronger dipole-dipole interactions, it is harder to break the bonds in AsF3 and thus its boiling point is higher.
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