Could it be that they are asking about the bond energy that is being released?
Since if you do (change of H), you'll get +158.
However, if you were doing this rxn in perspective of bond energy with (change of H) , you'll have:
(change of H) = bond break - bond make
( reactant) -( product)
Which will yield a -158
But anyway, have you try reading into the context of the problem? or any information they are giving to you before the question? Or if they told you if the rxn is exothermic or endothermic? Try looking for clues
I hope this helps.