How It Works

Step 1: Access the Hess's Law Calculator
Open the thermochemistry calculator.

Step 2: Input Target Equation and a Series of Known Step Equations
Enter the final reaction and the set of intermediate reactions with their $\Delta H$ values.

Step 3: Click 'Calculate Target Enthalpy'
Press the button to run the summation.

Step 4: Review the Final Enthalpy Change ($\Delta H$)
The tool will display the heat of reaction for the target equation based on the summed steps.