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Chemistry: A Molecular Approach | 3rd Edition | ISBN: 9780321809247 | Authors: Nivaldo J. Tro
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Determine the electron geometry, molecular geometry, and

Chapter 10, Problem 35E

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QUESTION:

Determine the electron geometry, molecular geometry, and idealized bond angles for each molecule. In which cases do you expect deviations from the idealized bond angle?

a. PF3                         b. SBr2 

c. CHCl3                 d. CS2

Questions & Answers

QUESTION:

Determine the electron geometry, molecular geometry, and idealized bond angles for each molecule. In which cases do you expect deviations from the idealized bond angle?

a. PF3                         b. SBr2 

c. CHCl3                 d. CS2

ANSWER:

Step 1  of 4

(a)    

According to the Lewis theory,

Number of valence electrons for P atom  = 5

Number of valence electrons in F atom  = 7

Total number of valence electrons in .

This gives four electron groups on the central P atom. So electron geometry is tetrahedral.

According to VSEPR theory, since there are 3 bonding groups and 1 lone pair, the molecular geometry is trigonal pyramidal.

It has an idealized bond angle of . Due to lone pair repulsion, we can expect a deviation from the idealized bond angle.

Therefore, electron geometry is  is  , molecular geometry is  and ideal bond angle .

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