If the bond energies of ( H - H , Br - Br ) and ( H - Br ) are ( 433,192 ) and ( 364 ~kJ ~mol ⁻¹ ) respectively, then ( H ^ ) for the reaction : ( H ₂(g)+ Br ₂(g) 2 HBr (g) )

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Correct answer: D. (- 103 ~kJ )

For the reaction, ( H ₂(g)+ Br ₂(g) 2 HBr (g) ) ( H ^ ) reaction (= H _ bonds booken (reactants) - H _ bonds formed (products) ) (= (433+192-2 364 ~kJ ~mol ⁻¹ ) ) (=-103 ~kJ ~mol ⁻¹ )

If the bond energies of ( H - H , Br - Br ) and ( H - Br ) are ( 433,192 ) and ( 364 ~kJ ~mol ⁻¹ ) respectively, then ( H ^ ) for the reaction : ( H ₂(g)+ Br ₂(g) 2 HBr (g) )

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