The principal source of the difference in the normal boiling points of ICl (97°C; molecular mass 162 amu) and Br2 (59°C; molecular mass 160 amu) is both dipole-dipole interactions and London dispersion forces.

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The principal source of the difference in the normal boiling points of ICl (97°C; molecular mass 162 amu) and Br2 (59°C; molecular mass 160 amu) is both dipole-dipole interactions and London dispersion forces.