QQuestionChemistry
QuestionChemistry
"According to VSEPR theory, what is the shape of a molecule of CS^2?
A. Bent
B. Trigonal-planar
C. Tetrahedral
D. Linear
"
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Answer
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Step 1:I'll solve this step by step using the VSEPR (Valence Shell Electron Pair Repulsion) theory guidelines:
Step 2:: Determine the central atom
- In CS^2, carbon (C) is the central atom
Step 3:: Count the total number of valence electrons
- Total valence electrons: $$4 + 12 = 16$$ electrons
- Carbon: 4 valence electrons - Sulfur (S): 6 valence electrons × 2 = 12 valence electrons
Step 4:: Draw the Lewis structure
- Electron domain geometry: $$4$$ domains = tetrahedral electron geometry
- Carbon will form double bonds with each sulfur atom - Electron arrangement: 4 electron domains around carbon
Step 5:: Determine molecular geometry
- All 4 electron domains are bonding domains - No lone pairs on the central carbon - Bonds are arranged linearly (180° apart)
Step 6:: Apply VSEPR theory rules
- Linear arrangement of atoms - No lone pairs - Symmetrical electron distribution
Final Answer
Linear Explanation: The molecule CS^2 has a linear shape because the two sulfur atoms are positioned 180° apart from the central carbon atom, with no lone pairs present.
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