Chemistry - Thermodynamics - I Question with Solution | TestHub

As${\mathrm{O}}_2$(l) is cooled at 1 atm pressure, it freezes to form solid I at 54.5 K. At a lower temperature, solid I rearrange to solid II, which has a different crystal structure. Thermal measurements show that for the phase transition solid I to slid II,$\mathrm{\Delta }\mathrm{H}=-\mathrm{743.1 }\mathrm{J}\mathrm{m}\mathrm{o}{\mathrm{l}}^{-1}$and$\mathrm{\Delta }\mathrm{S}=-\mathrm{17.0 }\mathrm{J}{\mathrm{K}}^{-1}\mathrm{m}\mathrm{o}{\mathrm{l}}^{-1}$. At what temperature are solids I and II in equilibrium?