QQuestionAnatomy and Physiology
QuestionAnatomy and Physiology
Which of the following statements about the structure of H^2S is false?
- H^2S has a trigonal planar electron-domain geometry.
- The Lewis structure of H^2S has eight valence electrons.
- The S-H-S angle in H^2S is less than 100.5°.
- There are two nonbonding electron domains on the S atom in H^2S.
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Answer
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Step 1: Identify the correct electron-domain geometry and the number of valence electrons for H₂S.
The electron-domain geometry for H₂S is not trigonal planar; it is bent or V-shaped. The Lewis structure of H₂S has eight valence electrons (six from the S atom and one from each H atom).
Step 2: Calculate the S-H-S angle in H₂S.
In a bent or V-shaped molecule, the bond angle is determined by the repulsion between the electron domains around the central atom. The repulsion is greatest between the larger domains, which, in this case, are the bonding domains. The S-H bond length is approximately 134 pm, while the size of an sp³ hybrid orbital is about 109 pm. Therefore, the S-H-S angle (θ) can be calculated using the following formula: where dSH is the S-H bond length and R is the sp³ hybrid orbital radius. Substituting the given values:
Final Answer
The S-H-S angle is approximately 92.1°, and the other statements are true.
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