A 810-G Quantity of Ethanol, in the Liquid State at Its

question 46

Multiple Choice

A 810-g quantity of ethanol, in the liquid state at its melting point of -114°C, is frozen at atmospheric pressure. The heat of fusion of ethanol is 1.04 × 10⁵ J/kg, the molecular mass is 46.1 g/mol, and the ideal gas constant is R = 8.314 J/(mol∙K) . The change in the entropy of the ethanol as it freezes is closest to

• A) -540 J/K.
• B) -490 J/K.
• C) -600 J/K.
• D) 490 J/K.
• E) 540 J/K.

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Definitions:

NREM Stage 2

A stage of sleep characterized by specific brain waves and sleep spindles that signify a deeper sleep than stage 1 and serve as a transitional period to deeper sleep stages.

REM Sleep

Rapid Eye Movement sleep, a unique phase of sleep characterized by fast eye movements, low muscle tone, and vivid dreams.

Consciousness

A state where an individual is conscious of their own life, senses, thoughts, environment, and experiences.

Self-Awareness

The conscious knowledge of one's own character, feelings, motives, and desires.