Using bond enthalpies, estimate the standard heat of the reaction for the drobromination of ethylene: Br H CH,=CH, + HBr ČH,-CH, TABLE 4-5. EMPIRICAL BOND ENTHALPIES AT 25°C (kcal/mole) Bond AH Bond ΔΗ C-CI H-H H-F 104 79 C-Br C-S 135 66 H-CI H-Br 0-0 0=0 0-H 103 62 C=8 C-N C=N 88 114 70 147 210 38 33 118 C=N N-N 111 C-H 99 C-0 N=N 100 84 170 C=0 C-C C=C C=C C-F N=N 226 N-H F-F 83 93 37 58 147 194 105 C-CI Br-Br C(s, graphite) - C(g) 172 46
Using bond enthalpies, estimate the standard heat of the reaction for the drobromination of ethylene: Br H CH,=CH, + HBr ČH,-CH, TABLE 4-5. EMPIRICAL BOND ENTHALPIES AT 25°C (kcal/mole) Bond AH Bond ΔΗ C-CI H-H H-F 104 79 C-Br C-S 135 66 H-CI H-Br 0-0 0=0 0-H 103 62 C=8 C-N C=N 88 114 70 147 210 38 33 118 C=N N-N 111 C-H 99 C-0 N=N 100 84 170 C=0 C-C C=C C=C C-F N=N 226 N-H F-F 83 93 37 58 147 194 105 C-CI Br-Br C(s, graphite) - C(g) 172 46
Chemistry: An Atoms First Approach
2nd Edition
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Author:Steven S. Zumdahl, Susan A. Zumdahl
Publisher:Steven S. Zumdahl, Susan A. Zumdahl
Chapter7: Chemical Energy
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Problem 62E: In a coffee-cup calorimeter, 1.60 g NH4NO3 is mixed with 75.0 g water at an initial temperature of...
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Transcribed Image Text:Using bond enthalpies, estimate the standard heat of the reaction for the
hydrobromination of ethylene:
Br H
CH,=CH, + HBr
ČH--CH,
TABLE 4-5. EMPIRICAL BOND ENTHALPIES
AT 25°C
(kcal/mole)
Bond
AH
Bond
ΔΗ
H-H
104
C-CI
79
H-F
135
C-Br
66
H-CI
H-Br
103
88
33
C-S
C=S
62
114
70
C-N
C=N
0-0
0=0
118
111
99
147
0-H
C=N
210
N-N
38
C-H
C-0
C=0
C-C
C=C
C=C
C-F
N=N
100
84
170
* 226
N=N
N-H
F-F
Cl-CI
Br-Br
83
93
37
147
194
58
105
46
C(s, graphite) =C(g) 172
%3D
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