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Hess's Law of Constant Heat Summation states that regardless of the multiple steps of a reaction, the total enthalpy change for the reaction is the sum of all changes. Thus, the enthalpy change is the same whether the reaction takes place in one step or in a series of steps. We can use Hess's Law by adding or subtracting chemical reactions with the same products or reactants. 
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Hess's law is due to enthalpy being a state function, which allows us to calculate the overall change in enthalpy by simply summing up the changes for each step of the way, until product is formed.

What is Hess's law ?

Hess's law states that the energy change in an overall chemical reaction is equal to the sum of the energy changes in the individual reactions comprising it.

All steps have to proceed at the same temperature and the equations for the individual steps must balance out.

Hess's Law of Constant Heat Summation states that regardless of the multiple steps of a reaction, the total enthalpy change for the reaction is the sum of all changes.

Thus, the enthalpy change is the same whether the reaction takes place in one step or in a series of steps. We can use Hess's Law by adding or subtracting chemical reactions with the same products or reactants.

Learn more about enthalpy here ;

https://brainly.com/question/16720480

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