alleryFor a gas-phase reaction, ∆rH can be estimated from bond enthalpies as:
ASum of all bond enthalpies
BReactant bonds minus product bonds
CProduct bonds divided by reactant bonds
DProduct bonds minus reactant bonds
Answer & Solution
Correct answer: B. Reactant bonds minus product bonds
Energy spent breaking reactant bonds minus energy recovered in product bonds gives ∆rH.
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