Given that, for the reaction, 1 2 H ₂+ 1 2 Cl ₂ HCl aligned & H _ f ( HCl )=-93 ~kJ / mol & B.E ( H ₂ )=434 ~kJ / mol & B.E ( Cl ₂ )=242 ~kJ / mol aligned The bond dissociation energy of HCl is

Step-by-step solution

Given, 1 2 H ₂+ 1 2 Cl ₂ HCl , H _ f =-93 ~kJ / mol In this reaction, one mole of HCl is formed H _ f of the reaction will remain same, i.e. -93 ~kJ / mol Let the bond dissociation energy of H - Cl bond be x For the given reaction, aligned H _ f & = B E _ (reactants) - B E _ (products) -93 & = 1 2 (434)+ 1 2 (242)- x -93 & =+338- x X & =431 ~kJ / mol aligned