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## Van 't Hoff equationThe ## Additional recommended knowledgeIf the enthalpy change of reaction is assumed to be constant with temperature, the definite integral of this differential equation between temperatures T is given by
_{2}In this equation T and _{1}K is the equilibrium constant at absolute temperature _{2}T. _{2}ΔH is the enthalpy change and ^{o}R is the gas constant.
Since and it follows that Therefore, a plot of the natural logarithm of the equilibrium constant versus the reciprocal temperature gives a straight line. The slope of the line is equal to minus the standard enthalpy change divided by the gas constant, ΔS. Differentiation of this expression yields the van 't Hoff equation.
^{o}/R |

This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Van_'t_Hoff_equation". A list of authors is available in Wikipedia. |