Answer
See the answer below.
Work Step by Step
$H_{H-H}=436; H_{Cl-Cl}=242; H_{H-Cl}=432\ kJ/mol$
$\Delta\chi=0102\sqrt{H_{H-Cl}-1/2(H_{H-H}+H_{Cl-Cl})}$
$\Delta\chi=0.984$
From figure 8-10, $\Delta\chi=1.0$
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