Use bond-dissociation enthalpies (Table 4-2, p. 143) to

Solution 40SP:

Here, we are going to calculate the bond enthalpy change for each of the reaction.

Step 1:

The overall enthalpy change for a reaction is the sum of the dissociation enthalpies

of the bonds broken minus the sum of the dissociation enthalpies of the bonds formed.

o = [Bond dissociation energy for bonds broken] -[Bond dissociation energy for bonds formed]