how do i draw lewis structures for:
CH2Cl2, CH3OH and NH3 .. plz help
Can't do them on these boards. CH2Cl2 will have 20 electrons.
  H-C-Cl
Now place two dots, representing a pair of electrons, at the dashes. On top add a H with two dots between C and H, and on the bottom add Cl with two dots between Cl and C. Then add two more dots around right Cl at top, right side, and bottom. On the lower Cl, add two dots right side, bottom and left side.
That should be 20 electrons.
Do CH3OH same way. It will have 14 electrons.
   H
   |
H-C-O-H
   |
   H
Hope that looks ok. You will need to add two electrons top and bottom of O.
  H
  |
:N:H
  |
  H
Should have 8 electrons.
Hope this looks ok.
thank so much
To draw Lewis structures for molecules such as CH2Cl2, CH3OH, and NH3, you need to follow a few steps. Here's a step-by-step guide for each molecule:
1. CH2Cl2 (Dichloromethane):
- Start by counting the total number of valence electrons for all the atoms in the molecule. Carbon (C) has 4 valence electrons, Hydrogen (H) has 1, and Chlorine (Cl) has 7.
- Add up the total valence electrons: 1(C) + 2(H) + 2(Cl) = 8 valence electrons.
- Arrange the atoms in a skeleton structure with the least electronegative atom, Carbon, in the center.
- Connect the surrounding atoms to the central atom with a single bond (C-Cl).
- Distribute the remaining electrons to complete the octets of the outer atoms (H and Cl). In this case, each Cl gets 3 lone pairs, and each H gets 1. Place the remaining electrons on the central Carbon atom.
- Check if the central atom has an octet. If not, try forming multiple bonds (double or triple) between the central atom and the surrounding atoms. In this case, double bond one of the C-Cl pairs.
- Draw the Lewis structure, ensuring each atom has an octet, and all the atoms are connected by lines representing bonds.
2. CH3OH (Methanol):
- Similar to the previous process, count the total valence electrons: 1(C) + 4(H) + 1(O) = 8 valence electrons.
- Place the Carbon atom in the center and connect the Hydrogen atoms (H) via single bonds (C-H).
- Place the Oxygen atom (O) with three non-bonding pairs of electrons.
- Distribute the remaining electrons to complete the octets of Hydrogen and Oxygen atoms.
- Draw the Lewis structure, ensuring each atom has an octet, and all atoms are connected.
3. NH3 (Ammonia):
- Count the total valence electrons: 1(N) + 3(H) = 8 valence electrons.
- Place the Nitrogen atom (N) in the center and connect the three Hydrogen atoms (H) via single bonds (N-H).
- Place the remaining electrons as lone pairs on the Nitrogen atom.
- Draw the Lewis structure, ensuring each atom has an octet, and all atoms are connected.
Remember, Lewis structures are just a representation of electron arrangement in molecules, so it's crucial to follow the octet rule and ensure all atoms have a complete octet (except hydrogen, which only needs 2 electrons).