HESS' LAW

• WHAT DOES HESS' LAW STATE?

  enthalpy change for a chemical reaction is the independent of the route taken
• USING ENTHALPY CHANGES OF FORMATION?

  reactants ---> products

  ↑ elements ↑
• USING ENTHALPY CHANGES OF COMBUSTION?

  elements ---> reactants

  ↓ products ↓