Introduction

Hess's Law states that the enthalpy change of a chemical reaction is the same regardless of the number of steps taken to get from reactants to products. This calculator helps you calculate the enthalpy change of a target reaction using known reactions.

Formally, Hess's Law can be stated as:

ΔHtotal = ΣΔHproducts - ΣΔHreactants

Where:

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Target Reaction

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Known Reactions