Molecular shape

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  • Thread starter daphnelee-mh
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  • #1
daphnelee-mh
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Homework Statement:
Experiment confirms the polarity of the molecule of formula BY3. Which molecular shapes are possible and which impossible for BY3?
Relevant Equations:
-
Answer given is " The molecule could be trigonal pyramidal or T shaped, but could not be trigonal planar."

I am confused as the shape of BF3 is trigonal planar...


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Answers and Replies

  • #2
Borek
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I suppose Y in the BY3 is intended to mean "some particular element", not "every possible element". In other words, question asks about possible shape of a specific molecule for which we know it is polar, not for a shape of every existing molecule - as not all of them will be identical (some will be polar, some will be not polar).
 
  • #3
epenguin
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Homework Statement:: Experiment confirms the polarity of the molecule of formula BY3. Which molecular shapes are possible and which impossible for BY3?
Homework Equations:: -

Answer given is " The molecule could be trigonal pyramidal or T shaped, but could not be trigonal planar."

I am confused as the shape of BF3 is trigonal planar...

Maybe they mean trigonal planar is not polar in the way BY3 is when B is not in the same plane as the Y's?
 
Last edited:
  • #4
jim mcnamara
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It is hard to know exactly what Y represents. Is there part of the problem statement not shown in the question?
 
  • #5
daphnelee-mh
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No, just written as this
 
  • #6
TeethWhitener
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Experiment confirms the polarity of the molecule of formula BY3.
snip
I am confused as the shape of BF3 is trigonal planar...
Is BF3 polar?
 
  • #7
daphnelee-mh
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Nonpolar, maybe I misunderstood the meaning, as I thought " confirms the polarity " may be polar or nonpolar
 
  • #8
Dr_Nate
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I can guarantee you that Y means "unspecified element" as others have mentioned.

"Confirms the polarity..." is actually poor wording. You should read it as "confirms it is a polar molecule".
 

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