What is Hess's law?

Problem Statement

What is Hess's law?

Step-by-Step Explanation

Hess's law says total enthalpy change is independent of the path between reactants and products.

1. Identify what the question is asking. In Chemistry, this usually means naming the known quantities, the unknown quantity, and the concept that connects them.
2. Write the relevant definition, rule, or relationship before substituting numbers or manipulating symbols.
3. Work one step at a time and keep units, signs, and restrictions visible.
4. Check whether the answer makes sense in the original context.

Final Answer

Hess's law says total enthalpy change is independent of the path between reactants and products. The reliable strategy is to start from the definition, apply the correct rule carefully, and then interpret the result in plain language.