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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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`1/2 H_(2) + 1/2 Cl_(2) to HCl`
`(104)/2 + 58/2 - 103 = -22 k cal`
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