Photon336
  • Photon336
Question
Chemistry
katieb
  • katieb
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Photon336
  • Photon336
Which compound is most likely to have the highest heat of vaporization?
Photon336
  • Photon336
A. H2O B. NH3 C. HF D. all three are the same
Photon336
  • Photon336
@sweetburger this was taken from that test you sent

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taramgrant0543664
  • taramgrant0543664
They are all liquids at room temperature aren't they?
Photon336
  • Photon336
doesn't specify however they should be
Photon336
  • Photon336
All have the capability to hydrogen bond including an Hydrogen covalently bonded to either an F,O, or N
Photon336
  • Photon336
So i don't see how they could have equal heats of vaporization, to me one factor to consider would be molecular mass as well.
taramgrant0543664
  • taramgrant0543664
If mass was taken into consideration it would be HF as it has the biggest molecular mass
Photon336
  • Photon336
Water has a heat of vaporization value of 40.65 kJ/mol. ΔvapH (kJ/mol) Temperature (K) HF 25.2
Photon336
  • Photon336
HF has a larger molecular weight than water and the same ability to hydrogen bond so why would these values be different?
Rushwr
  • Rushwr
Hey can't we take it because all of it has the capability of forming H bonds. H bonds have the highest bond strength Hence the heat needed for liquid to convert to vapor is high. So I think all have the same range
taramgrant0543664
  • taramgrant0543664
The intermolecular bonds possibly
Photon336
  • Photon336
BTW the say that H2O is the answer.
Photon336
  • Photon336
@taramgrant0543664 you are correct
Photon336
  • Photon336
so, they say that water can form more hydrogen bonds than HF, so it's the extent of H-bonding
taramgrant0543664
  • taramgrant0543664
Good to know
taramgrant0543664
  • taramgrant0543664
H2O can form 2 where as the other two can only form 1 each
Photon336
  • Photon336
|dw:1438032699574:dw|
Photon336
  • Photon336
messy but I think this solves our problem
taramgrant0543664
  • taramgrant0543664
Yep I believe it does
Rushwr
  • Rushwr
@Photon336 another one please!

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