Use the table below to determine ?H for the following reaction Bond Energies, kJ
ID: 796740 • Letter: U
Question
Use the table below to determine ?H for the following reaction
Bond Energies, kJ/mol
Single Bonds
H
C
N
O
S
F
Cl
Br
I
H
432
C
411
346
N
386
305
167
O
459
358
201
142
S
363
272
---
---
286
F
565
485
283
190
284
155
Cl
428
327
313
218
255
249
240
Br
362
285
243
201
217
249
216
190
I
295
213
---
201
---
278
208
175
149
Multiple Bonds
C=C
602
C=N
615
C=O
799
C?C
835
C?N
887
C?O
1072
N=N
418
N=O
607
S=O (in SO2)
532
N?N
942
O2
494
S=O (in SO3)
469
Bond Energies, kJ/mol
Single Bonds
H
C
N
O
S
F
Cl
Br
I
H
432
C
411
346
N
386
305
167
O
459
358
201
142
S
363
272
---
---
286
F
565
485
283
190
284
155
Cl
428
327
313
218
255
249
240
Br
362
285
243
201
217
249
216
190
I
295
213
---
201
---
278
208
175
149
Explanation / Answer
H2C=CH2(g) + I2(g) => CH2ICH2I(g)
DH(reaction) = bond energy of reactants - bond energy of products
= 4 x C-H + 1 x C=C + 1 x I-I - 4 x C-H - 1 x C-C - 2 x C-I
= 1 x C=C + 1 x I-I - 1 x C-C - 2 x C-I
= 1 x 602 + 1 x 149 - 1 x 346 - 2 x 213
= -21 kJ
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