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Hess's Law Calculator

Calculate reaction enthalpy via Hess's law

🔥Hess's Law Calculator

e.g. -285.8, -393.5

Hess's Law states that the total enthalpy change of a reaction is independent of the pathway taken — it depends only on the initial and final states. This allows calculation of ΔH for reactions that are difficult to measure directly.

Fun Fact

Hess's Law (1840) was derived before the first law of thermodynamics was formally stated. It is essentially a special case of energy conservation applied to chemical reactions.

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