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If the enthalpy change for the reaction,...

If the enthalpy change for the reaction,
`CH_(4)(g)+Cl_(2)(g)toCH_(3)Cl(g)+HCl(g),DeltaH=-25`kcal,
bond energy of C-H is 20 kcal `mol^(-1)` greater than the bond energy of C-Cl and bond energies of H-H and H-Cl are same in magnitude, then for the reaction `H_(2)(g)+Cl_(2)(g)to2HCl(g),DeltaH=`?

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