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8 solutions

Second and Third Laws of Thermodynamics

Q. If this substance is a perfect crystal at T=0 K, what is the value of S at this temperature?

Solved • Dec 1, 2019

Second and Third Laws of Thermodynamics

Q. "Rotational" and "vibrational" motions contribute to the entropy in atomic gases like He and Xe. True. False.

Solved • Dec 1, 2019

Second and Third Laws of Thermodynamics

Q. "Translational motion" of molecules refers to their change in spatial location as a function of time. True. False.

Solved • Dec 1, 2019

Second and Third Laws of Thermodynamics

Q. The third law of thermodynamics says that the entropy of a perfect, pure crystal at absolute zero increases with the mass of the crystal. False. True.

Solved • Dec 1, 2019

Second and Third Laws of Thermodynamics

Q. Water gas, a mixture of H2 and CO2, is a fuel made by reacting steam with red-hot coke (a by product of coal distillation): H2O(g) + C(s) ⇋ CO(g) + H2(g) Using a table of thermodynamic data, estimate the temperature at which the reaction begins to favor the formation of products.

Solved • Nov 22, 2019

Second and Third Laws of Thermodynamics

Q. Use the following data to determine the normal boiling point, in K, of mercury. Hg(l) ΔH°f = 0 (by definition) ΔS° = 77.4 J/K/mol Hg(g) ΔH°f = 60.78 kJ/mol ΔS° = 174.7 J/K.mol

Solved • Nov 22, 2019

Second and Third Laws of Thermodynamics

Q. Q Which of the following statements concerning entropy is/are CORRECT? 1. The entropy of a substance increases when converted from a liquid to a solid. 2.The entropy of a substance decreases as its temperature increases. 3.All substances have positive entropy values at temperatures above 0 K. Options: a.1 only b.2 only c.3 only d.1 and 2 e.1, 2, and 3

Solved • Nov 1, 2019