Question

draw the lewis dot structure of ch2oh and find formal charge on O .​

Answer 1

Step 1: Find valence e- for all atoms. Add them together.

C:4x2=8

H:1x6=6

O:6

Total=20

Step2: Find octet e- for each atom and add them together.

C:8x2=16

H:2x6=12

O:8

Total=36

Step3: Subtract step 1 total from step 2. Gives you bonding e-.

36-20=16e-

Step 4: Find the number of bonds by dividing the number in step 3 by 2, (because each bond is made of 2 e-)

16e-/2= 8 bond pairs

Step 5: Find the number of nonbonding (lone pairs) e-. Subtract step 3 number from step 1.

20-16= 4e-=2 lone pairs

Use information from steps 4 and 5 to draw the lewis structure.

Lewis dot structure of C2H5OH

Alternatively, a dot method can be used to draw the lewis structure.

Calculate the total valence electrons in the molecule.

C:4x2=8

H:1x6=6

O:6

Total=20 i.e . 10 pairs

Methanol CH3OH would be obtained using the same method but would be missing CH2, ethylene.