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Q.

The reaction ${CH}_{4} (g) + {Cl}_{2} (g) ⟶ {CH}_{3} Cl (g) + HCl$ $(g) has Δ H = - 25 kcal$
Bond Bond Energy, kcal
$E_{C} - Cl$ $84$
$ε_{H - Cl}$ $103$
$ε_{C} - H$ $x$
$ε_{Cl - Cl}$ $y$
$x : y = 9 : 5$
From the given data, what is the bond energy of $Cl - Cl bond?$

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a

$57.85 k c a l$

b

$80 k c a l$

c

$67.85 k c a l$

d

$70 k c a l$

answer is D.

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Detailed Solution

$- 25 = 36 a + 5 a - (84 + 27 a + 103)$

$162 = 14 a$

$a = 11.57$

$E_{Cl - Cl} = 5 \times 11.57 = 57.85$

Hence, option D is correct.

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The reaction CH4(g)+Cl2(g)⟶CH3Cl(g)+HCl (g) has ΔH=−25kcalBondBond Energy, kcalEC−Cl84εH−Cl103εC−HxεCl−Clyx:y=9:5 From the given data, what is the bond energy of Cl−Cl bond?