Problem: Hydrogen fluoride has a dipole moment of 1.83 D; its boiling point is 19.34°C. Ethyl fluoride (CH3CH2F) has an almost identical dipole moment and has a larger molecular weight, yet its boiling point is -37.7°C. Explain.

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Hydrogen fluoride has a dipole moment of 1.83 D; its boiling point is 19.34°C. Ethyl fluoride (CH3CH2F) has an almost identical dipole moment and has a larger molecular weight, yet its boiling point is -37.7°C. Explain.