Enthalpy-Concentration Diagrams (Hx)
Temperature is the parameter to determine the enthalpy and concentration values. The diagram will have different shapes dependeing on the behavior of the system, for example, in an ideal solution the isotherms will be straight lines. On the other hando, for a real behavior of the mixture, isotherms will be curves. If the enthalpy is negative, then the mixture is exothermic, if the enthalpy is positive, the mixture is endothermic.
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References:
Louis Theodore, Francesco Ricci, Timothy Vanvliet. Thermodynamics for the Practicing Engineer. (2011).
Louis Theodore, Francesco Ricci, Timothy Vanvliet. Thermodynamics for the Practicing Engineer. (2011).