Hess's Law

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  • Hess's Law
    • What is Hess's Law?
      • The total enthalpy change for a reaction is independent on the route taken
      • Handy for working out enthalpy changes of reactions that you can not find directly by doing experiments
    • Using Enthalpies of Formation
      • Useful for calculating enthalpy changes that you can not find directly
      • Need to know the standard enthalpy change for all reactants & products
        • elements are 0 - element being formed from element so no change in enthalpy
      • Standard enthalpy changes are all measured at 298K

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