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10 solutions

Second and Third Laws of Thermodynamics

Q. Consider the reaction 2C2H6(g) + 7O2(g) → 4CO2(g) + 6H2O(g) for which ΔH° = 2.855x10^3 kJ and ΔS° = 92.70 J/K at 298.15 K. (1) Calculate the entropy change of the UNIVERSE when 1.891 moles of C2H6(g) react under standard conditions at 298.15 K. (2) Is this reaction reactant or product favored under standard conditions? (3) If the reaction is product favored, is it enthalpy favored, entropy favored, or favored by both enthalpy and entropy? If the reaction is reactant favored, choose 'reactant favored'.

Solved • Feb 19, 2020

Second and Third Laws of Thermodynamics

Q. Consider the reaction 2CO(g) + 2NO(g) → 2CO2(g) + N2(g) for which ΔH° = -746.6 kJ and ΔS° = -198.0 J/K at 298.15 K. (1) Calculate the entropy change of the UNIVERSE when 1.546 moles of CO(g) react under standard conditions at 298.15 K. (2) Is this reaction reactant or product favored under standard conditions? (3) If the reaction is product favored, is it enthalpy favored, entropy favored, or favored by both enthalpy and entropy? If the reaction is reactant favored choose 'reactant favored'.

Solved • Feb 19, 2020

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