Which of the following has the lowest entropy per mole? A) liquid sodium at 100

Question

Which of the following has the lowest entropy per mole? A) liquid sodium at 100 degree C B) gaseous sodium at 900 degree C and 0.5 atm C) a solid solution of sodium in potassium at 30 degree C D) gaseous sodium at 900 degree C and 1 atm E) solid sodium at 30 degree C The standard enthalpy of vaporization of Freon-10, CCl_4, is 29.82 kJ/mol at its normal boiling point of 77 degree C. What is the change of entropy for 1 mol of liquid Freon-10 when it vaporizes at its normal boiling point? A) 8.52 times 10^-2 J/K B) 1.04 times 10^4 J/K C) 85.2 J/K D) 0.387 J/K E) 3.87 times 10^2 J/K The enthalpy of vaporization (Delta H_vap degree) of benzene is 30.7 kJ/mol at its normal boiling point of 353.3 K. What is Delta S_vap degree at this temperature? A) 86.9 J/(mol middot K) B) 0.087 J/(mol middot K) C) 11.5 J/(mol middot K) D) 0.0115 J/(mol middot K) E) 383 J/(mol middot K) The third law of thermodynamics states that A) the entropy of the universe is increasing. B) the entropy of the universe is constant.

Explanation / Answer

Q2.

lowest entropy --> most organized, least chaotic

by definition, must be a solid, so ignore all other phases

possible options:

C or E

note that a mixture is chaotic, we require "pure substances"

so ignore C

choose E; solid sodium at T = 30°C

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