🔥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.
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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.
References
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