Solved: Molecular Shapes; the VSEPR Model (Sections)In

Chapter 5, Problem 20E

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QUESTION:

Problem 20E

Molecular Shapes; the VSEPR Model (Sections)

In which of the following molecules can you confidently predict the bond angles about the central atom, and for which would you be a bit uncertain? Explain in each case. (a) H2S, (b) BCl3, (c) CH3I, (d) CBr4, (e) TeBr4

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QUESTION:

Problem 20E

Molecular Shapes; the VSEPR Model (Sections)

In which of the following molecules can you confidently predict the bond angles about the central atom, and for which would you be a bit uncertain? Explain in each case. (a) H2S, (b) BCl3, (c) CH3I, (d) CBr4, (e) TeBr4

ANSWER:

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(a)

The total number of valance electrons in  is 8. According to VSEPR theory, these four pairs of electrons occupy the corners of a tetrahedron to form a tetrahedral geometry.  Since there are two lone pairs of electrons on S, the bond angle will deviate from the ideal tetrahedral bond angle. The Lewis structure of  is:

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