A student measures the reaction H2(g) + Cl2(g) <=> 2 HCl(g) concentrations at a few different temperatures and obtains the equilibrium constant. The student wants to use the van't Hoff equation to roughly determine the reaction enthalpy assuming that it does not change over the region of interest. T (K)        300                           500                         1000 Keq        4×1031                   4×1018                     4×108 So the student plots the data in the lnK vs 1/T diagram and obtains a linear fitting shown below:     What is the reaction enthalpy value obtain from this figure? __________ kJ/mol

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