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When a phase change occurs in the reaction, there is an additional enthalpy change that must be accounted for on top of the normal reaction enthalpy. The enthalpies of molecules are different in different states.
If the Br2 to 2Br stayed in the same phase then you would not have to consider the vaporization of Br, but since there is a phase change, this must be considered on top of the bonds of the molecule being broken
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