QQuestionChemistry
QuestionChemistry
Draw lewis dot structure for CH^3 + and show formal charges
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Answer
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Step 1:: Determine the total number of valence electrons in the molecule.
For CH^3 +, there are 4 valence electrons from Carbon (group 4A) and 3 valence electrons from Hydrogen (group 1A), minus one electron for the positive charge. Therefore, there are a total of 6 valence electrons.
Step 2:: Draw the skeletal structure of the molecule.
Draw a Carbon atom bonded to three Hydrogen atoms, with a positive charge on the Carbon atom.
Step 3:: Distribute the valence electrons around the atoms.
Give each Hydrogen atom one electron to form a hydrogen atom (:H). Give the Carbon atom the remaining valence electrons to form three carbon-hydrogen bonds (:C:H).
Step 4:: Calculate the formal charge on each atom.
The formal charge on an atom is calculated as follows: For the Carbon atom, it has 4 valence electrons, no non-bonding electrons, and 8 bonding electrons (4 from the bonds with Hydrogen atoms). Therefore, the formal charge on the Carbon atom is: For each Hydrogen atom, it has 1 valence electron, 2 non-bonding electrons (from the hydrogen atom), and 1 bonding electron (from the bond with Carbon). Therefore, the formal charge on each Hydrogen atom is:
Step 5:: Draw the Lewis dot structure with formal charges.
:C<sup>+</sup>:H :H :H
Final Answer
The Lewis dot structure for CH^3 + is shown above, with a formal charge of + 1 on the Carbon atom and a formal charge of 0 on each Hydrogen atom.
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