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Eugene S.
University of Minnesota - Twin Cities

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Problem 24 Easy Difficulty

What is Hess's law? Why is it useful?

Answer

$697-06-24 \mathrm{RQ}$ SA-9877
SR: 5276
Hess's Law:
The change in enthalpy for a stepwise process is the sum of the enthalpy change of the steps.
$$
\begin{array}{c}{A+2 B \rightarrow C \quad \Delta H_{1}} \\ {C \rightarrow 2 D} & {\Delta H_{2}} \\ {\frac{\mathrm{Ex} )}{A+2 B \rightarrow 2 D \quad \Delta H_{3}=\Delta H_{1}+\Delta H_{2}}}\end{array}
$$
These relationships make it possible to determine $\Delta H$ for a reaction without directly measuring
it in the laboratory.

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Video Transcript

So this question asks what is has his law and why is it useful? And so has his law states that the total and will be changed of a reaction is the same, whether it's in one step or several steps, and so this could be drawn out like this. Let's say we have a reaction of reactant ce two products and that's described by adult H. Now we can describe the reactant CE with the Delta H formation, for the reactant is and we can describe the products also by adult h of formation off the products. And so what this looks like in an equation is that the Delta H of reaction is equal to the Delta H formation of the products minus the Delta H formation of the reactant CE. And so are the reason that this is useful is because if it's impossible impractical to calculate the delta h of reaction by itself, we can use this has his law approach to ah theoretically find the Delta h of reaction for any potential reaction at all. And so ah, that is what has his law is and why it's useful

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