As O₂(l) Is Cooled at 1 Atm, It Freezes at 54.5

question 5

Multiple Choice

As O₂(l) is cooled at 1 atm, it freezes at 54.5 K to form Solid I. At a lower temperature, Solid I rearranges to Solid II, which has a different crystal structure. Thermal measurements show that H for the I  II phase transition is -743.1 J/mol and that S for the same transition is -17.0 J/K mol. At what temperature are Solids I and II in equilibrium?

• A) 43.7 K
• B) 2.06 K
• C) 53.4 K
• D) 31.5 K
• E) They can never be in equilibrium because they are both solids.

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