None Which of the following will always result in a spontaneous process at all temperatures?a) +AS and +AHb) AS and +AHc) +AS and -AHd) -AS and -AHe) More than one of the aboveshow work. don'tgive Ai generatedsolutionWhen the volume of a gas increases, which of the following is true?a) Entropy decreases and Gibb's free energy increases.b) Entropy decreases and Gibb's free energy decreases.c) Entropy increases and Gibb's free energy increases.d) Entropy increases and Gibb's free energy decreases.e) None of the above

Analyze the Gibbs free energy equation: ΔG = ΔH − TΔSFor a spontaneous reaction, the sign of ΔG is…

Answered: Which of the following will always…

Chemistry for Engineering Students

4th Edition

ISBN:9781337398909

Author:Lawrence S. Brown, Tom Holme

Publisher:Lawrence S. Brown, Tom Holme

Chapter10: Entropy And The Second Law Of Thermodynamics

Section: Chapter Questions

Problem 10.47PAE: The reaction CO2(g)+H2(g)CO(g)+H2O(g) is not spontaneous at room temperature but becomes spontaneous...

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Similar questions

The reaction CO2(g)+H2(g)CO(g)+H2O(g) is not spontaneous at room temperature but becomes spontaneous at a much higher temperature. What can you conclude from this about the signs of H and S , assuming that the enthalpy and entropy changes are not greatly affected by the temperature change? Explain your reasoning.
Define the following: a. spontaneous process b. entropy c. positional probability d. system e. surroundings f. universe
What happens to the entropy of the universe during a spontaneous process?
Recall that incomplete combustion of fossil fuels occurs when too little oxygen is present and results in the production of carbon monoxide rather than carbon dioxide. Water is the other product in each case. (a) Write balanced chemical equations for the complete and incomplete combustion of propane. (b) Using these equations, predict which will have the larger change in entropy. (c) Use tabulated thermodynamic data to calculate G for each reaction. (d) Based on these results, predict the sign and value of G for the combustion of carbon monoxide to form carbon dioxide.
10.69 If a sample of air were separated into nitrogen and oxygen molecules (ignoring other gases present), what would be the sign of for this process? Explain your answer. The next four questions relate to the following paragraph [Frank L. Lambert, Journal of Chemical Education, 76(10), 1999, 1385]. "The movement of macro objects from one location to another by an external agent involves no change in the objects' physical (thermodynamic) entropy. The agent of movement undergoes a thermodynamic entropy increase in the process."
What is entropy? Why is entropy important?
10.51 The combustion of acetylene was used in welder's torches for many years because it produces a very hot flame: C2H2(g)+52O2(g)2CO2(g)+H2O(g) H= -1255.5 kJ (a) Use data in Appendix E to calculate S for this reaction, (b) Calculate G and show that the reaction is spontaneous at 25°C. (c) Ls there any temperature range in which this reaction is not spontaneous? (d) Do you think you could use Equation 10.4 to calculate such a temperature range reliably? Explain your answer.
For the reaction NO(g)+NO2(g)N2O3(g) , use tabulated thermodynamic data to calculate H and S. Then use those values to answer the following questions. (a) Is this reaction spontaneous at 25°C? Explain your answer. (b) If the reaction is not spontaneous at 25°C, will it become spontaneous at higher temperatures or lower temperatures? (c) To show that your prediction is accurate, choose a temperature that corresponds to your prediction in part (b) and calculate G . (Assume that both enthalpy and entropy are independent of temperature.)
How does the second law of thermodynamics explain a spontaneous change in a system that becomes more ordered when that process is exothermic?
Consider the following reaction at 25C: Cl2(g)2Cl(g)K=1.01037 (a) Calculate G for the reaction at 25C. (b) Calculate G f for Cl(g) at 25C.
What is the second law of thermodynamics? For any process, there are four possible sign combinations for Ssys and Ssurr. Which sign combination(s) always give a spontaneous process? Which sign combination(s) always give a non-spontaneous process? Which sign combination(s) may or may not give a spontaneous process?
Acetic acid in vinegar results from the bacterial oxidation of ethanol. C2H5OH(l)+O2(g)CH3COOH(l)+H2O(l) What is S for this reaction? Use standard entropy values. (See Appendix C for data.)

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