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Question

How can one describe Hess's law ?


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Solution

Hess's law:

  • It is also known as Hess's law of constant heat summation.
  • It is named after German Hess a Russian chemist and physician.
  • It states that “ whether a chemical reaction is conducted in a single step or in multiple steps, the enthalpy change will always be the same”.
  • The nature and state of the reactants and products determine the enthalpy of a reaction. It is unaffected by the path that the chemical reaction takes.
  • The law is actually only a specific case of the first law of thermodynamics (law of conservation of energy) i.e. energy can neither be created nor can be destroyed.

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