Using bond energies from the table, estimate ΔH for the reaction below. CH 3 CH
ID: 710619 • Letter: U
Question
Using bond energies from the table, estimate ΔH for the reaction below.
CH3CH3(g) ↔ CH2=CH2(g) + H2(g)
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 ºC
835
C ºN
887
C ºO
1072
N=N
418
N=O
607
S=O (in SO2)
532
N ºN
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
delta H = BE of reactanst - BE of products
= 6(C-H) + C-C -(C=C) -4(C-H) -(H-H)
= 6( 411) + 346-602-4(411) -432
= 134 KJ/mol
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