
Chemistry
10th Edition
ISBN: 9781305957404
Author: Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher: Cengage Learning
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(a) Compare the bond enthalpies (Table 8.3) of the carbon–
carbon single, double, and triple bonds to deduce an average
π -bond contribution to the enthalpy. What fraction of
a single bond does this quantity represent? (b) Make a similar
comparison of nitrogen–nitrogen bonds. What do you
observe? (c) Write Lewis structures of N2H4, N2H2, and N2,
and determine the hybridization around nitrogen in each
case. (d) Propose a reason for the large difference in your
observations of parts (a) and (b).

Transcribed Image Text:TABLE 8.3 Average Bond Enthalpies (kJ/mol)
Single Bonds
C-H
413
N-H
391
О—н
463
F-F
155
348
N-N
163
0-0
146
293
201
0-F
190
CI-F
253
C-0
358
N-F
272
0-CI
203
Cl-CI
242
C-F
485
N-CI
200
0-I
234
C-CI
328
N-Br
243
Br-F
237
C-Br
276
S-H
339
Br-CI
218
C-I
240
Н-Н
436
S-F
327
Br-Br
193
C-S
259
Н—F
567
S-CI
253
Н—СІ
431
S-Br
218
I-CI
208
Si-H
323
Н—Br
366
S-S
266
I-Br
175
Si-Si
226
Н-I
299
I-I
151
Si-C
301
Si-O
368
Si-CI
464
Multiple Bonds
614
N=N
418
0=0
495
839
N=N
941
615
607
523
C=N
891
S=S
418
799
1072
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