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Chapter 7: Q101E (page 405)

The molecule XF3 has a dipole moment. Is X boron or phosphorus?

Short Answer

Expert verified

The molecular structure of \({\rm{P}}{{\rm{F}}_{\rm{3}}}\)is not symmetrical and hence dipole does not cancels out.

Step by step solution

01

Concept Introduction

It is a measure of the system's overall polarity .The electric dipole moment gives the separation of positive and negative electrical charges inside a system.

02

Find lone pair and dipole moment

There are no lone pairs in\({\rm{B}}{{\rm{F}}_{\rm{3}}}\),however one lone pair is present in\({\rm{P}}{{\rm{F}}_{\rm{3}}}\).

Therefore, as a result, the molecular structure of \({\rm{P}}{{\rm{F}}_{\rm{3}}}\) is asymmetrical, and the dipole does not cancel out.

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Most popular questions from this chapter

There are three possible structures for \({\rm{PC}}{{\rm{l}}_{\rm{2}}}{\rm{\;}}{{\rm{F}}_{\rm{3}}}\)with phosphorus as the central atom. Draw them and discuss how measurements of dipole moments could help distinguish among them.

Draw the Lewis structures and predict the shape of each compound or ion:

(a) \({\rm{C}}{{\rm{O}}_{\rm{2}}}\)

(b) \({\rm{NO}}_{\rm{2}}^{\rm{ - }}\)

(c) \({\rm{S}}{{\rm{O}}_{\rm{3}}}\)

(d) \({\rm{S}}{{\rm{O}}_{\rm{3}}}^{{\rm{2 - }}}\)

Which of the following molecules and ions contain polar bonds? Which of these molecules and ions have dipole moments?

  1. \({\rm{Cl}}{{\rm{F}}_{\rm{5}}}\)
  2. \({\rm{Cl}}{{\rm{O}}_{\rm{2}}}{\rm{ - }}\)
  3. \({\rm{TeC}}{{\rm{l}}_{\rm{4}}}^{{\rm{2 - }}}\)
  4. \({\rm{PC}}{{\rm{l}}_{\rm{3}}}\)
  5. \({\rm{Se}}{{\rm{F}}_{\rm{4}}}\)
  6. \({\rm{P}}{{\rm{H}}_{\rm{2}}}^{\rm{ - }}\)
  7. \({\rm{Xe}}{{\rm{F}}_{\rm{2}}}\)

Does a cation gain protons to form a positive charge or does it lose electrons?

Which compound in each of the following pairs has the larger lattice energy? Note: \({\rm{B}}{{\rm{a}}^{{\rm{2 + }}}}\) and \({{\rm{K}}^{\rm{ + }}}\) have similar radii; \({{\rm{S}}^{{\rm{2 - }}}}\) and \({\rm{C}}{{\rm{l}}^{\rm{ - }}}\) have similar radii. Explain your choices.

(a) \({{\rm{K}}_{\rm{2}}}{\rm{O}}\) or \({\rm{N}}{{\rm{a}}_{\rm{2}}}{\rm{O}}\)

(b) \({{\rm{K}}_{\rm{2}}}{\rm{S}}\) or \({\rm{BaS}}\)

(c) \({\rm{KCl}}\) or \({\rm{BaS}}\)

(d) \({\rm{BaS}}\) or \({\rm{BaC}}{{\rm{l}}_{\rm{2}}}\)
See all solutions

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