At standard conditions, if the change in the enthalpy for the following reaction is -109 kJ mol-1
H2(g)+Br2(g) 2HBr(g)
and the bond energy of H2 and Br2 is 435 kJ mol-1 and 192 kJ mol-1, respectively, what is the bond energy (in kJ mol-1) of HBr?
1. 368
2. 736
3. 518
4. 259
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