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Hess's Law of constant heat summation .

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Hess's Law of constant heat summation : the total enthalpy change accompanying a chemical reaction is the same whether the reaction takes place in one or more steps.

  • When chemical equations are added, subtracted or multiplied, the enthalpy changes can also be added, subtracted or multiplied.
  • The sign of ∆rH gets reversed on reversing a chemical equation.

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