The dependance of the equilibrium constant of a reaction on temperature is given by the van't Hoff equation: lnK = -change of H/(RT) + C
where C is a constant. The following table gives the equilibrium constant (KP) at various temperatures for the reaction of nitrogen monoxide with oxygen gas that produces nitrogen dioxide:
T(K) Kp
600 138
700 5.12
800 0.436
900 0.0130
Calculate the enthalpy of reaction.