Final answer:
Hess's law states that the enthalpy change of a reaction is equal to the sum of the enthalpy changes of each individual step.
Step-by-step explanation:
According to Hess's law, the enthalpy change of the reaction will equal the sum of the enthalpy changes of the steps. This means that if a reaction can be represented as the sum of several steps, the overall enthalpy change of the reaction is calculated by adding up the enthalpy changes of each individual step.