Chapter 18, Problem 18.9P

Consider the decomposition of gaseous ${\text{N}}_{\text{2}}{\text{O}}_{\text{4}}:$
   ${\text{N}}_{\text{2}}{\text{O}}_{\text{4}}(g)\to {\text{2NO}}_{\text{2}}(g)\Delta {\text{S}}^{\text{o}}=+175.7\text{J/K}$
Estimate the temperature conditions for a spontaneous reaction.