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Chemical Thermodynamics and Energetic - Hess’ Law of Constant Heat Summation

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Estimated time: 2 minutes
CBSE: Class 12

Law: Hess Law of Constant Heat Summation

Statement: If a reaction takes place in several steps, its standard reaction enthalpy is equal to the sum of the standard enthalpies of all the intermediate steps into which the overall reaction can be divided, at the same temperature.

Note: Since enthalpy is a state function, the total enthalpy change is independent of the pathway — only the initial and final states matter.

Application: 

\[\Delta_rH^\circ=\Delta_rH_1^\circ+\Delta_rH_2^\circ+\Delta_rH_3^\circ+\ldots\]

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