Problem: How would we modify the figure if we were looking at PH3 rather than NH3?

FREE Expert Solution

We are asked how would we modify the figure if we were looking at PH3 rather than NH3.


Compare the molecules: 

  • We can observe that we both have 3 H on each molecule. 
  • If we look at the periodic table, we can see that P and N are both on group 5A.


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Problem Details

How would we modify the figure if we were looking at PH3 rather than NH3?

1) Draw the Lewis structure.  A central N is single bonded left, right, and below to H, and has a single pair of dots above. 2) Determine electron-domain geometry about the central atom from VSEPR model and Table 9.1.  A pyramid is drawn, with N at the center.  The lone pair of dots is the top point above N, and the three points below N are the three Hs.  One is bonded in the plane of the page , one is into the page, and one is out of the page. 3) Using Table 9.4, select sp3 hybrid orbital set.  sp3 hybrid orbitals on N overlap with 1s orbitals on three hydrogens to make three N-H bonds. A model of hybrid orbitals shows a central N atom single bonded to three hydrogens, each angled down, and a nonbonding pair above.


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