Chemistry- electronegativity and bonding

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SUMMARY

The discussion centers on the relationship between electronegativity, molecular size, and boiling points of hydrogen halides (HI, HCl, HBr, HF). The boiling points at 100 mmHg are as follows: HI at -72.1°C, HCl at -114°C, HBr at -97.7°C, and HF at -28.2°C. Despite the expectation that smaller molecules would have higher boiling points due to increased electronegativity, the results indicate that factors such as hydrogen bonding and molecular mass significantly influence boiling points. The conclusion emphasizes that electronegativity alone does not dictate boiling point behavior in these compounds.

PREREQUISITES
  • Understanding of electronegativity and its trends in the periodic table.
  • Knowledge of molecular size and its impact on physical properties.
  • Familiarity with hydrogen bonding and its effects on boiling points.
  • Basic principles of gas laws and vapor pressure.
NEXT STEPS
  • Research the role of hydrogen bonding in determining boiling points of compounds.
  • Study the molecular structure of hydrogen halides and their physical properties.
  • Explore the relationship between molecular mass and boiling point in various compounds.
  • Investigate the concept of vapor pressure and its implications in physical chemistry.
USEFUL FOR

Chemistry students, educators, and researchers interested in molecular interactions, physical chemistry, and the properties of hydrogen halides.

Dell
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the temperature for the following to reach a pressure of 100mmHg is as follows(celsius))

HI -> -72.1
HCl -> -114
HBr -> -97.7
HF -> -28.2

how can this be? since they are all combinations of H and an element of the last column before the noble gas surely the smaller the size of the molecule, the higher the temperature will be? since they are all a combination of H and an atom whose radius goes R=(F<Cl<Br<I) so the electronegativity goes (F>Cl>Br>I). surely the temp should go with the electronegativity??
 
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It might be a combination of electronegativity, mass, hydrogen bonding, size, etc...
 

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