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Hess's law of constant heat summation, also known simply as Hess's law, is a relationship in physical chemistry and thermodynamics [1] named after Germain Hess, a Swiss-born Russian chemist and physician who published it in 1840. The law states that the total enthalpy change during the complete course of a chemical reaction is independent of ...
Hess's law states that the sum of the energy changes of all thermochemical equations included in an overall reaction is equal to the overall energy change. Since Δ H {\displaystyle \Delta H} is a state function and is not dependent on how reactants become products as a result, steps (in the form of several thermochemical equations) can be used ...
Hess' law of constant heat summation (1840): The energy change accompanying any transformation is the same whether the process occurs in one step or many. [3] These statements preceded the first law of thermodynamics (1845) and helped in its formulation. Thermochemistry also involves the measurement of the latent heat of phase transitions.
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Coulomb's law: Physics: Charles Augustin de Coulomb: Law of Charles and Gay-Lussac (frequently called Charles's law) Thermodynamics: Jacques Charles and Joseph Louis Gay-Lussac: Clifford's theorem Clifford's circle theorems: Algebraic geometry, Geometry: William Kingdon Clifford: Curie's law: Physics: Pierre Curie: Curie–Weiss law: Physics ...
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From the first law of thermodynamics, =, where W is the work done by the system. When only expansion work is possible for a process we have Δ U = Q V {\displaystyle \Delta U=Q_{V}} ; this implies that the heat of reaction at constant volume is equal to the change in the internal energy Δ U {\displaystyle \Delta U} of the reacting system.
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