Question

Place the following substances in order of increasing vapour pressure at a given temperature. NF3 NH3...

Place the following substances in order of increasing vapour pressure at a given temperature.


NF3 NH3 BCl3

A) NH3 < NF3 < BCl3
B) BCl3 < NF3 < NH3
C) BCl3 < NH3 < NF3
D) NH3 < BCl3 < NF3
E) NF3 < NH3 < BCl3
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Answer #1

answer : A ) NH3 < NF3 < BCl3

explanation :

  • among there NH3 can form hydrogen bond .it can be in liquid state. so its boiling point is high that means its vapour pressure is low
  • NF3, which is trigonal pyramidal, and therefore, polar. But NF3 does not exhibit hydrogen bonding, and so the intermolecular attraction is less for liquid NF3, which makes it easier for NF3 molecules to go to the vapor phase.
  • BCl3 is trigonal planar and therefore, nonpolar. With only London dispersion forces, there is less intermolecular attraction, and it is much easier for BCl3 molecules to go from liquid to vapor.
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