alleryStart learning →Iodine monochloride and bromine have similar masses of about 160 amu, so they experience:
ASimilar dispersion forces
BIdentical dipole moments
CEqual ionic attractions
DThe same molecular shape
Answer & Solution
Correct answer: A. Similar dispersion forces
1. Dispersion strength scales with the number of electrons, which tracks molar mass.
2. Iodine monochloride and bromine have similar masses of about 160 amu.
3. Therefore they experience similar London dispersion forces.
4. Any remaining difference in boiling point cannot be attributed to dispersion forces.
5. The difference comes from iodine monochloride being polar while bromine is not.
_Source: OpenStax Chemistry 2e (CC BY 4.0), Ch 10 'Liquids and Solids', sections 10.1-10.6_
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