Use the data given in the table to calculate the value of AGxn at 25° C for the reaction described by the equation Compound AG (kJ/mol) A +387.7 B A+B C -592.9 C +402.0 AGrxn = 196.8 Incorrect If AHxn and ASPxn are both positive values, what drives the spontaneous reaction and in what direction at standard conditions? The spontaneous reaction is entropy-driven to the right. The spontaneous reaction is entropy-driven to the left. The spontaneous reaction is enthalpy-driven to the left. The spontaneous reaction is enthalpy-driven to the right. Incorrect kJ mol

Use the data given in the table to calculate the value of AGxn at 25° C for the reaction described by the equation Compound AG (kJ/mol) A +387.7 B A+B C -592.9 C +402.0 AGrxn = 196.8 Incorrect If AHxn and ASPxn are both positive values, what drives the spontaneous reaction and in what direction at standard conditions? The spontaneous reaction is entropy-driven to the right. The spontaneous reaction is entropy-driven to the left. The spontaneous reaction is enthalpy-driven to the left. The spontaneous reaction is enthalpy-driven to the right. Incorrect kJ mol

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter17: Spontaneity, Entropy, And Free Energy

Section: Chapter Questions

Problem 27Q: Consider the reaction N2O2(g) 2NO2(g) where PNO2=0.29 atm and PN2O4=1.6. For this reaction at these...

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Consider the decomposition of red mercury(II) oxide under standard state conditions.. 2HgO(s,red)2Hg(l)+O2(g) (a) Is the decomposition spontaneous under standard state conditions? (b) Above what temperature does the reaction become spontaneous?
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Elemental boron, in the form of thin fibers, can be made by reducing a boron halide with H2. BCl3(g) + 3/2 H2(g) B(s) + 3HCl(g) Calculate H, S, and G at 25 C for this reaction. Is the reaction predicted to be product favored at equilibrium at 25 C? If so, is it enthalpy driven or entropy driven?
Chemists and engineers who design nuclear power plants have to worry about high-temperature reactions because it is possible for water to decompose. (a) Under what conditions does this reaction occur spontaneously? 2H2O(g) 2H2(g) + O2(g) (b) Under conditions where the decomposition of water is spontaneous, do nuclear engineers have to worry about an oxygen/hydrogen explosion? Justify your answer.
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Calculate G at 415 K for each of the reactions in Question 18. State whether the reactions are spontaneous.
On the basis of your experience, predict which of the following reactions are spontaneous. (a) CO2(s)CO2(g) at 25°C (b) NaCl(s)NaCl(l) at 25°C (c) 2NaCl(s)2Na(s)+Cl2(g) (d) CO2(g)C(s)+O2(g)
Discuss the effect of temperature change on the spontaneity of the following reactions at 1 atm: (a) Al2O3(s)+2Fe(s)2Al(s)+Fe2O3(s) H =851.4kJ;S =38.5J/K (b) N2H4(l)N2+2H2(g) H =50.6kJ;S =0.3315kJ/K (c) SO3(g)SO2(g)+12 O2(g) H =98.9kJ;S =0.0939kJ/K
Calculate G at 82C for reactions in which (a) H=293kJ;S=695J/K(b) H=1137kJ;S=0.496kJ/K(c) H=86.6kJ;S=382J/K
The free energy change, G, for a process at constant temperature and pressure is related to Suniv and reflects the spontaneity of the process. How is G related to Suniv? When is a process spontaneous? Nonspontaneous? At equilibrium? G is a composite term composed of H, T, and S. What is the G equation? Give the four possible sign combinations for H and S. What temperatures are required for each sign combination to yield a spontaneous process? If G is positive, what does it say about the reverse process? How does the G = H TS equation reduce when at the melting-point temperature of a solid-to-liquid phase change or at the boiling-point temperature of a liquid-to-gas phase change? What is the sign of G for the solid-to-liquid phase change at temperatures above the freezing point? What is the sign of G for the liquid-to-gas phase change at temperatures below the boiling point?
What types of experiments can be carried out to determine whether a reaction is spontaneous? Does spontaneity have any relationship to the final equilibrium position of a reaction? Explain.