Figure 7 shows the displayed formulae for the reaction of bromine Figure 7
H
H
H-C
H-- Br
H +
Br
Br
H-C-Br +
H
H
Table 5
shows the bond energies and the overall energy change in the reaction.
Table 5
C-H
Br — Br
C-Br
H-Br
Overall energy
change
Energy in
kJ/mol
412
193
х
366
- 51
Calculate the bond energy X for the C-Br bond.
Use Figure 7 and Table 5
(4 marks]

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