The reaction CH_4 (g) + Cl_2 (g) → CH_3 Cl(g)
+ HCl(g) has ΔH = −25 kcal and bond
dissociation energy of C − Cl, H − Cl,
C − H and Cl − Cl is given as 84 kcal/mol,
103 kcal/mol, x kcal/mol and y kcal/mol
respectively. Given x : y = 9 : 5, then
bond energy of Cl − Cl bond in kcal/mol
is
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