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

question 42

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 ΔH for the I → II phase transition is -743.1 J/mol and that ΔS 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.

---

Definitions:

Assessment

The evaluation or estimation of the nature, quality, or ability of someone or something, often used in educational and professional contexts.

Utility Analysis

Is the attempt to measure, in more objective terms, the impact and effectiveness of HRM practices in terms of such metrics as a firm’s financial performance.

Selection System

The process by which organizations identify, assess, and choose candidates for employment.

Real Benefit

The actual advantageous impact received from a product, service, or action, beyond any superficial gains.