QQuestionChemistry
QuestionChemistry
"Determine the electron geometry, molecular geometry, and idealized bond angles for each of the following molecules:
a. CF^4
b. NF^3
c. OF^2
d. H^2S"
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Answer
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Step 1:
For CF₄, the electron geometry is tetrahedral and the molecular geometry is also tetrahedral. The idealized bond angles are 109.5 degrees.
Step 2:: Determine the number of electron groups around the central atom.
- In a CF₄ molecule, Carbon (C) is the central atom and Fluorine (F) atoms are surrounding it. - Each F atom brings 1 pair of electrons to form a sigma bond with C. - Hence, there are 4 electron groups around the C atom.
Step 3:: Determine the electron geometry.
- With 4 electron groups, the electron geometry is tetrahedral (regularly spaced at 109.5 degrees).
Step 4:: Determine the molecular geometry.
- Since all electron groups are bonding pairs (no lone pairs), the molecular geometry is the same as the electron geometry, which is tetrahedral.
Step 5:: Determine the idealized bond angles.
- The idealized bond angles are 109.5 degrees for a tetrahedral geometry.
Step 6:
For NF₃, the electron geometry is trigonal pyramidal and the molecular geometry is also trigonal pyramidal. The idealized bond angles are approximately 107 degrees.
Step 7:: Determine the number of electron groups around the central atom.
- In an NF₃ molecule, Nitrogen (N) is the central atom and Fluorine (F) atoms are surrounding it. - Each F atom brings 1 pair of electrons to form a sigma bond with N. - Additionally, N has 1 lone pair of electrons. - Hence, there are 4 electron groups around the N atom.
Step 8:: Determine the electron geometry.
- With 4 electron groups, the electron geometry is tetrahedral (regularly spaced at 109.5 degrees, but distorted due to the lone pair).
Step 9:: Determine the molecular geometry.
- With 3 bonding pairs and 1 lone pair, the molecular geometry is trigonal pyramidal.
Step 10:: Determine the idealized bond angles.
- The idealized bond angles are approximately 107 degrees for a trigonal pyramidal geometry.
Step 11:
For OF₂, the electron geometry is bent or angular and the molecular geometry is also bent or angular. The idealized bond angles are approximately 104.5 degrees.
Step 12:: Determine the number of electron groups around the central atom.
- In an OF₂ molecule, Oxygen (O) is the central atom and Fluorine (F) atoms are surrounding it. - Each F atom brings 1 pair of electrons to form a sigma bond with O. - Additionally, O has 2 lone pairs of electrons. - Hence, there are 4 electron groups around the O atom.
Step 13:: Determine the electron geometry.
- With 4 electron groups, the electron geometry is tetrahedral (regularly spaced at 109.5 degrees, but distorted due to the lone pairs).
Step 14:: Determine the molecular geometry.
- With 2 bonding pairs and 2 lone pairs, the molecular geometry is bent or angular.
Step 15:: Determine the idealized bond angles.
- The idealized bond angles are approximately 104.5 degrees for a bent or angular geometry.
Step 16:
For H₂S, the electron geometry is bent or angular and the molecular geometry is also bent or angular. The idealized bond angles are approximately 92 degrees.
Step 17:: Determine the number of electron groups around the central atom.
- In an H₂S molecule, Sulfur (S) is the central atom and Hydrogen (H) atoms are surrounding it. - Each H atom brings 1 pair of electrons to form a sigma bond with S. - Additionally, S has 2 lone pairs of electrons. - Hence, there are 4 electron groups around the S atom.
Step 18:: Determine the electron geometry.
- With 4 electron groups, the electron geometry is tetrahedral (regularly spaced at 109.5 degrees, but distorted due to the lone pairs).
Step 19:: Determine the molecular geometry.
- With 2 bonding pairs and 2 lone pairs, the molecular geometry is bent or angular.
Step 20:: Determine the idealized bond angles.
- The idealized bond angles are approximately 92 degrees for a bent or angular geometry.
Final Answer
a. CF₄: Electron geometry: tetrahedral, Molecular geometry: tetrahedral, Idealized bond angles: 109.5 degrees b. NF₃: Electron geometry: tetrahedral, Molecular geometry: trigonal pyramidal, Idealized bond angles: approximately 107 degrees c. OF₂: Electron geometry: tetrahedral, Molecular geometry: bent or angular, Idealized bond angles: approximately 104.5 degrees d. H₂S: Electron geometry: tetrahedral, Molecular geometry: bent or angular, Idealized bond angles: approximately 92 degrees
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