Question

Bonddissociation enthalpies are used to estimate enthalpy changes. Forthe reaction: O2(g)+ 2 H2(g)--> 2 H2O(g).

a.)estimate theenergy needed to break the bonds between all atoms of the reactantmolecules for the reaction above. (2 points)

b.) Use youranswer from part a.) along with the average O-H bond dissociationenthalpy to estimate the enthalpy change for the formation of twomoles of H2O(g).(2 points)

c.) Does youranswer to part b.) over-estimate or under-estimate the heatreleased in the formation H2O(g)?[Hint: use the standard enthalpy of formation ofH2O(g).](1 point)

d.) Which ofthe bond enthalpies used to estimate the enthalpy change for thereaction above might differ from their averagevalues?