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Please show work! I've tried this problem a few times, but seem to be going wrong somewhere. The answer should be 366 kJ/mol, but I do not understand how to arrive at that solution. Thank you!

a.) AHxn for the reaction below was determined using bond dissociation energies (BDEs) to be -57 kJ Using the table of BDE below, find the bond energy for H-Br c-C НН НН H-C-C-Br НН + H-Br Bond C-C с-с C-H C-Br H-Br Bond Enthalpy (kJ/mol) 348 614 413 276 b.) Did your calculation use the four C-H bonds that are present in both the reactant and product states? If so, did you need to use them?

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