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

Chemistry: Matter and Change
1st Edition
ISBN:9780078746376
Author:Dinah Zike, Laurel Dingrando, Nicholas Hainen, Cheryl Wistrom
Publisher:Dinah Zike, Laurel Dingrando, Nicholas Hainen, Cheryl Wistrom
Chapter15: Energy And Chemical Change
Section: Chapter Questions
Problem 89A
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Halons are fluorocarbons that contain bromine, such as
CBrF3. They are used extensively as foaming agents for
fighting fires. Like CFCs, halons are very unreactive and
ultimately can diffuse into the stratosphere. (a) Based on
the data in Table , would you expect photodissociation
of Br atoms to occur in the stratosphere? (b) Propose a
mechanism by which the presence of halons in the stratosphere
could lead to the depletion of stratospheric ozone.

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
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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