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The question asks if CHI3 or CHF3 has a higher normal melting point. The solution manual says the answer is CHI3 because is has greater London dispersion forces but I thought CHF3 was polar/had dipole interactions. Why does CHI3 have stronger intermolecular interactions?
Both CHI3 and CHF3 are polar and have London Dispersion forces. However, CHI3 has a stronger London Dispersion force because CHI3 is a much bigger molecule than CHF3. Iodine has a greater molar mass than fluorine, and the bigger the atom, the stronger the intermolecular force. This would then require a higher boiling point.
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