lewis structure n ch3 3

Charlotte

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28-02-2025

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The formula CH₃₃, sometimes written as C₂H₆, actually represents ethane, not a distinct molecule called "trimethylmethyl." There's no molecule with the name "trimethylmethyl." Let's clarify this and then proceed to draw the Lewis structure for ethane (C₂H₆).

Understanding the Formula

The formula CH₃₃ is misleading. It implies three methyl groups (CH₃) attached to a central carbon, which is impossible given carbon's valency. Carbon can only form four bonds. To correctly represent two carbon atoms each bonded to three hydrogens and one carbon, we use the formula C₂H₆.

Drawing the Lewis Structure of Ethane (C₂H₆)

Here's how to draw the Lewis structure for ethane, step-by-step:

1. Count Valence Electrons: Carbon has 4 valence electrons, and hydrogen has 1. With two carbons and six hydrogens, the total number of valence electrons is (2 * 4) + (6 * 1) = 14.

2. Central Atom: Place the two carbon atoms as the central atoms.

3. Single Bonds: Connect the two carbons with a single bond (2 electrons used).

4. Hydrogen Bonds: Attach three hydrogen atoms to each carbon using single bonds. This uses (6 * 2) = 12 electrons.

5. Check Electron Count: We've used 14 electrons (2 + 12 = 14), matching the total valence electrons calculated in step 1. All atoms now have a full valence shell.

6. Final Structure: The final Lewis structure shows each carbon atom bonded to three hydrogens and one other carbon, resulting in a complete octet for each carbon atom (8 valence electrons) and a duet for each hydrogen atom (2 valence electrons).

Here's a visual representation:

     H   H
     |   |
H - C - C - H
     |   |
     H   H

Note: The lines represent single covalent bonds (two electrons shared between atoms).

3D Structure of Ethane

It's important to remember that the Lewis structure is a 2D representation. Ethane's actual shape is three-dimensional. Both carbon atoms are tetrahedral, meaning each carbon is bonded to four other atoms, resulting in a bond angle of approximately 109.5 degrees. The molecule can also rotate around the carbon-carbon bond.

Further Considerations

While the formula CH₃₃ might seem to suggest a different molecule, it doesn't represent a real, stable compound. Understanding valence electron rules and proper molecular formulas is crucial for accurately drawing Lewis structures. The correct formula and structure of the molecule in question is crucial for understanding its properties and reactivity. Remember to always verify the molecular formula before attempting to draw a Lewis structure.