Chapter 15, Problem 15.146QP

The dependence of the equilibrium constant of a reaction on temperature is given by the van’t Hoff equation.

$\ln k=\frac{-\Delta H^{\circ }}{RT}+C$

where C is a constant. The following table gives the equilibrium constant (K_P) for the reaction at various temperatures.

$\text{2NO}\left(g\right)+{\text{O}}_{\text{2}}\left(g\right)\rightleftarrows {\text{2NO}}_{\text{2}}\left(g\right)$

Determine graphically the ΔH° for the reaction.