Question

Why does Hess's law allow you to determine the enthalpy change of a reaction?

Answer 1

Enthalpy is a state function

Explanation:

The Hess's law allows us to determine the enthalpy change of a reaction because enthalpy is a state function. It does not depend on the individual path take in going from reactants to products in the reaction.

• Enthalpy changes are the heat changes accompanying physical and chemical changes.
• It is the difference between the heat content of product in the final state and the reactants.
• Enthalpy changes for some reactions are not easily measurable experimentally.
• To calculate such heat changes, we apply the Hess's law of heat summation.
• The law states that "the heat change of a reaction is the same whether it occurs in a step or several steps".
• The Hess's law is simply based on the first law of thermodynamics by which we know that energy is conserved in every system.

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Hess's law brainly.com/question/11293201

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