Chapter 5, Problem 5.47E

For the reaction

${\text{2NO}}_{\text{2}}\left(\text{g}\right)\rightleftharpoons {\text{N}}_{\text{2}}{\text{O}}_{\text{4}}\left(\text{g}\right)$

$K\left(\text{0°C}\right)=58$ and $K\left(\text{100°C}\right)=0.065$. Estimate ${\Delta }_{\text{rxn}}H°$ for this reaction.