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  3. Chemistry
  4. What is the bond energy of Cl-Cl bond in the reaction (CH)4(.g.)+(Cl)2(.g.) arrow (CH)3Cl(.g.)+HCl(.g.) which has Δ H=-25kcal . Data: <ol> <li>Bond energy of C-Cl = 84kcal </li> <li>Bond energy H-Cl = 103kcal .</li> <li>Bond energies of C-H and Cl-CI bonds are in the ratio x:y . If x:y=9:5 .</li> </ol>

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Q. What is the bond energy of $Cl-Cl$ bond in the reaction $\left(CH\right)_{4}\left(\right.g\left.\right)+\left(Cl\right)_{2}\left(\right.g\left.\right) \rightarrow \left(CH\right)_{3}Cl\left(\right.g\left.\right)+HCl\left(\right.g\left.\right)$ which has $\Delta H=-25kcal$ .
Data:
  1. Bond energy of $C-Cl$ = $84kcal$
  2. Bond energy $H-Cl$ = $103kcal$ .
  3. Bond energies of $C-H$ and $Cl-CI$ bonds are in the ratio $x:y$ . If $x:y=9:5$ .

NTA AbhyasNTA Abhyas 2020

Solution:

The reaction
$-25=36a+5a-\left(\right.84+27a+103\left.\right)$
$162=14a$
$\Rightarrow a=11.57$
$\Rightarrow E_{C 1 - a}=5\times 11.57=57.85k$ cal