## Bond Length

Brice McKeown 3D
Posts: 35
Joined: Fri Sep 28, 2018 12:25 am

### Bond Length

When looking at the bond length of a resonance structure, is the bond length of a resonance double bond the exact middle of the length of the single bond and double bond. Like if the double bond is 100 and the single bond is 110, is the resonance bond length 105? Or just a value in between the two lengths.

Blake Salfer 1B
Posts: 30
Joined: Fri Sep 28, 2018 12:18 am

### Re: Bond Length

I think it is the middle or average of the bond lengths so it would be 105

Michael Torres 4I
Posts: 92
Joined: Thu May 10, 2018 3:00 am
Been upvoted: 1 time

### Re: Bond Length

I think finding an average of the given bond values is the best way to find the bond length in the resonance structure. It may not be necessarily exact or equal to the actual observed value, but it should be fairly close.

Sophia Ding 1B
Posts: 62
Joined: Fri Sep 28, 2018 12:16 am

### Re: Bond Length

It's hard to say if it would be the exact average of it as it would depend on the atoms present within the molecule and their associated pull to affect the bond length. But I would agree that it would be fairly close to the average of the two, but may lean slightly towards one of the bond lengths numbers as in class we saw how the resonance bond length was around 1.29 A or so when the associated bond lengths were 1.20 A and 1.40 A

EllaBerry
Posts: 68
Joined: Fri Sep 28, 2018 12:29 am

### Re: Bond Length

To find the length of a resonance bond length you find the average of the length between the two bond lengths given. This is because in a resonance structure, no bonds are actually longer than others, it just appears that way when we draw them as a lewis structure.

anishathomas
Posts: 35
Joined: Fri Sep 28, 2018 12:25 am

### Re: Bond Length

It would be the average of the lengths given for the resonance structures.

Posts: 64
Joined: Fri Sep 28, 2018 12:27 am

### Re: Bond Length

Like others have said, its the average of the lengths. so if you had 2 single bonds and one double bond, you would add all three and divide by 3.

Dana Wilks 3I
Posts: 30
Joined: Fri Sep 28, 2018 12:23 am

### Re: Bond Length

I believe you would need experimental data to determine the exact bond length, but you could definitely say that it would be in between the two values for single/double bonds, so in this case between 100 and 110.

Pritish Patil 1K
Posts: 60
Joined: Fri Sep 28, 2018 12:24 am

### Re: Bond Length

I believe it would be the average of the two lengths.

Kevin Arokiaraj 4E
Posts: 18
Joined: Wed Nov 15, 2017 3:03 am

### Re: Bond Length

You determine the length of a resonance structure by finding the average of the given lengths.