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7.13 Laws of Thermochemistry

Lavoisier and Laplace Law

It states that the heat change (or enthalpy change) of a chemical reaction is exactly equal but opposite in sign for the reverse reaction.

Hess's Law of Constant Heat Summation

The change in state of a system produced by a specified chemical reaction is definite. The corresponding enthalpy change is definite, since the enthalpy is a state function.

Thus, “If a specified set of reactants is transformed to a specified set of products by more than one sequence of reactions, the total enthalpy change must be the same for every sequence.”

7.14 Bond Energies

The amount of energy required to break one mole of a particular type of bond between the atoms in the gaseous state under one atmospheric pressure and the specified temperature is called bond dissociation energy.

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