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The bond dissociation energy of gaseous ...

The bond dissociation energy of gaseous `H_(2),Cl_(2)` and `HCl` are `104,58` and `103 kcal mol^(-1)` respecitvely. Calculate the enthalpy of formation for `HCl` gas.

A

`+44 kCal`

B

`+22 k Cal`

C

`-22 kCal`

D

`-44 kCal`

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