Q24Short answer
Enthalpy is an extensive property. In general, if enthalpy of an overall reaction A→B along one route is ∆r H and ∆r H1, ∆rH2, ∆r H3 ..... represent enthalpies of intermediate reactions leading to product B. What will be the relation between ∆r H for overall reaction and ∆r H1 , ∆r H2 ..... etc. for intermediate reactions.
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∆r H = ∆r H1+ ∆r H2 + ∆r H3 ..... 1665 –1 –1