00:04
So there, in this question we have a part of a molecule.
00:07
We have c2h5o.
00:12
So if we think about the structure for this, we have two carbons bonded to each other.
00:18
We have five hydrogens.
00:20
So one, two, three on the first carbon.
00:25
The second carbon has two more of the hydrogens because we know each carbon needs four bonds.
00:31
And then the carbon is bonded to the oxygen.
00:33
Well, oxygen atoms have six valence electrons.
00:38
So that means it's going to have two lone pairs and it's free to bond to two other atoms.
00:45
Or it's free to form one other bond is what i actually meant to say.
00:49
All right, so we have some options here.
00:51
Letter a says we have a hydrogen.
00:55
Well, sure enough, we could put a hydrogen here.
00:58
The hydrogen brings in its electron and the oxygen has its.
01:02
So this would work.
01:05
All right, let's go ahead and erase that.
01:11
And we'll put oxygen single dot back again.
01:15
So letter a is okay to finish out that molecule properly.
01:20
Letter b, we have another ch3.
01:22
We know carbon needs four bonds.
01:25
So one of its bonds is going to be with that oxygen and then it's bonded to three hydrogen.
01:33
So that one is good also.
01:37
All right, let's look at our next option...