Why do molecular weight and BP/MP differ in formaldehyde and ethane?

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SUMMARY

The discussion clarifies that despite ethane and formaldehyde having similar molecular weights, their boiling points (BP) and melting points (MP) differ significantly due to intermolecular interactions. Formaldehyde exhibits stronger intermolecular forces, including hydrogen bonding and dipole-dipole interactions, while ethane relies solely on London dispersion forces. This difference in intermolecular forces directly contributes to formaldehyde's higher BP and MP compared to ethane.

PREREQUISITES
  • Understanding of molecular structure and bonding
  • Knowledge of intermolecular forces, including hydrogen bonding and dipole-dipole interactions
  • Familiarity with boiling point and melting point concepts
  • Basic chemistry concepts related to molecular weight
NEXT STEPS
  • Research the role of hydrogen bonding in molecular interactions
  • Study the differences between dipole-dipole interactions and London dispersion forces
  • Explore the molecular structure of formaldehyde and ethane
  • Investigate how molecular weight influences physical properties in organic compounds
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Chemistry students, educators, and professionals interested in molecular interactions and physical properties of organic compounds.

whit88
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While both molecules have a very similar molecular weight, their boiling and melting points vary significantly. Explain the behavoir.


i have look everywhere to try and figure out why the bp and mp are different from mw but i just can't get anywhere!
 
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what kinds of compounds are you talking about?
 
ethane and formaldehyde
 
what's the structure of formaldehyde? I forgot.
 
does this have to do with intermolecular interactions?
 
if it does, it's because stronger intermolecular forces occur between the different components of formaldehyde like hydrogen bonding, dipole-dipole interactions, and London forces while only London forces occur in between the different components of ethane, giving formaldehyde a higher boiling/melting point.
 

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