Hess's Law Calculator

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:

ΔH_total = ΣΔH_products - ΣΔH_reactants

Where:

• ΔH_total is the total enthalpy change of the target reaction
• ΔH_products is the sum of the enthalpies of the products in the known reactions
• ΔH_reactants is the sum of the enthalpies of the reactants in the known reactions

Let's get started!