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Bond dissociation energies of H(2),Cl(2)...

Bond dissociation energies of `H_(2),Cl_(2)` and `HCl_((g))` are 104, 58 and 103 kcal `"mol"^(-1)` respectively. Calculate the enthalpy of formation of HCl gas.

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Objective reaction `(1)/(2)H_(2)(g)+(1)/(2)Cl_(2)(g)rarr HCl(g) , Delta H = ?`
`Delta H = sum("Bond energy")_(P)- sum ("Bond energy")_(P) = [(1)/(2)xx104+(1)/(2)xx58]-[103]=22 kcal mol^(-1)`
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