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  • Enthalpy is an extensive property. In general, if enthalpy of an overall reaction A→B along one route is \Delta _{r}Hand \Delta _{r}H_{1}, \Delta _{r}H_{2},\Delta _{r}H_{3}….. represent enthalpies of intermediate reactions leading to product B.

Enthalpy is an extensive property. In general, if enthalpy of an overall reaction A→B along one route is \Delta _{r}Hand \Delta _{r}H_{1}, \Delta _{r}H_{2},\Delta _{r}H_{3}….. represent enthalpies of intermediate reactions leading to product B. What will be the relation between \Delta _{r}H for overall reaction and \Delta _{r}H_{1},\Delta _{r}H_{2} etc. for intermediate reactions.

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According to Hess’s law, \Delta _{r} H = \Delta _{r} H_{1} + \Delta _{r} H_{2} +\Delta _{r} H_{3}.....

This is so because during the reaction A\rightarrow B, B’s formation undergoes various intermediate reactions, with the overall value of the enthalpy being \Delta _{r}H.

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