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NaCl has a higher boiling point than HCl because it is ionic vs HCl which is not. Ion-ion bonds are always more strongly held together than non ion-ion bonds. That means you would need more energy to break apart NaCl than you would for HCl, which results in the higher boiling point of NaCl.
NaCl has a higher boiling point because there is more ionic forces present due to a higher electronegativity difference. The difference between Na and Cl in electronegativity is larger than that of H and Cl making the NaCl molecule be significantly more ionic. This ionic force then causes there to be stronger attraction between the molecules and further a higher boiling point.
NaCl would have a higher boiling point than HCl since it has ion-ion intermolecular forces compared to the dipole-dipole forces of HCl. These ion-ion forces makes the molecule an ionic molecule whereas HCl would be covalent. Therefore, since ionic bonds are stronger specifically ion-ion forces, the bonds will be harder to break apart when boiling leading to a higher boiling point.
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