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Question
Enthalpy is an extensive property. In general, if enthalpy of an overall reaction A→B along one route is ∆rH and ∆rH1, ∆rH2, ∆rH3 ..... represent enthalpies of intermediate reactions leading to product B. What will be the relation between ∆rH for overall reaction and ∆rH1, ∆rH2 ..... etc. for intermediate reactions.
Solution
According to Hess’s law, ∆rH = ∆rH1 + ∆rH2 + ∆rH3
This is so because during the reaction A→B, B’s formation undergoes various intermediate reactions, with the overall value of the enthalpy being ∆rH.
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