Calculate `Delta H` , for the reaction ,
`H - undersetoverset(|)(H)oversetunderset(|)(H)(C ) - Cl (g) to C(s) + 2H(g) + 2Cl (g)`
Bond energies of C - H bond , C - Cl bond are 415 kJ and 326 kJ respectively .

Explanation

`Delta H = sum B.E` of (reactants ) - `sum B.E ` of (products )
` = 2 xx (C - H) + 2 [(Cl) - O)]` (B.E of all free atoms = 0 )
` = 2 xx 415 + 2 xx 326 `
` = 830 + 652 + 1482 kJ`