Energy required to break ethane into its constituent atoms is $2860 K J$ . If the $C - H$ bond energy is $420$ KJ, the $C - C$ bond energy is:

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Solution

Energy required to break $C H_{2} - C H_{3}$ into its constituents atoms is $2860 K J$ .
$C H_{3} - C H_{3}$ contain $6$ $C - H$ bonds, $1$ $C - C$ bond.
$∴ 2860 = 6$ [Bond energy of $C - H$ bond] $+ 1$ [Bond energy of $C - C$ ]
$\Rightarrow 2860 = 6 [420] +$ [Bond energy of $C - C$ ]
$∴$ Bond energy of $C - C$ is $340 K J$ .

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