- #1
Julia78
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Hi- I have been working on a problem and cannot figure out the last part.
First, I needed to calculate the average pi-bond contribution to the enthalpy for C-C single, double, and triple bonds.
Given: C-C single=348, doube=614, triple=839 kj/mol
I calculated:
839-614=225
614-348=226
So the average is 245.5 kj/mol
Next, I had to make similar comparison for N-N bonds.
Given: N-N single=163; double= 418; triple= 941 kj/mol
Calculations:
941-418=523
418-163=255
So, the average is 389 kj/mol
Now what I am trying to figure out is why there is such a difference in those numbers?
Why pi-bond contribution to bond enthalpy is so much lower in carbon?
Can anybody give me a hint? Does it have to do with numbers of electrons, or orbital configuration?
First, I needed to calculate the average pi-bond contribution to the enthalpy for C-C single, double, and triple bonds.
Given: C-C single=348, doube=614, triple=839 kj/mol
I calculated:
839-614=225
614-348=226
So the average is 245.5 kj/mol
Next, I had to make similar comparison for N-N bonds.
Given: N-N single=163; double= 418; triple= 941 kj/mol
Calculations:
941-418=523
418-163=255
So, the average is 389 kj/mol
Now what I am trying to figure out is why there is such a difference in those numbers?
Why pi-bond contribution to bond enthalpy is so much lower in carbon?
Can anybody give me a hint? Does it have to do with numbers of electrons, or orbital configuration?