3.Photochemical smog is formed through a sequence of reactions, thefırst of which is N2(g) + O2(g) → 2NO(g). A Hº for this reaction is180.6 kJ/mol. Calculate A S° for this reaction using the tableprovided.SubstanceS° (J/mol*K)N2(g)191.5O2(g)205.0NO(g)210.6NO2(g)240.5O(g)161.0421.2 J/mol*K0.606 J/mol*K-24.7 J/mol*K24.7 J/mol*K210.6 J/mol*K

3. Photochemical smog is formed through a sequence of reactions, the first of which is N2(g) + O2(g) → 2NO(g). A Hº for this reaction is 180.6 kJ/mol. Calculate A Sº for this reaction using the table provided. Substance S° (J/mol*K) N2(g) 191.5 O2(g) 205.0 NO(g) 210.6 NO2(g) 240.5 O(g) 161.0 421.2 J/mol*K 0.606 J/mol*K -24.7 J/mol*K 24.7 J/mol*K 210.6 J/mol*K

3. Photochemical smog is formed through a sequence of reactions, the first of which is N2(g) + O2(g) → 2NO(g). A Hº for this reaction is 180.6 kJ/mol. Calculate A Sº for this reaction using the table provided. Substance S° (J/molK) N2(g) 191.5 O2(g) 205.0 NO(g) 210.6 NO2(g) 240.5 O(g) 161.0 421.2 J/molK 0.606 J/molK -24.7 J/molK 24.7 J/molK 210.6 J/molK

Chemistry: An Atoms First Approach

2nd Edition

ISBN:9781305079243

Author:Steven S. Zumdahl, Susan A. Zumdahl

Publisher:Steven S. Zumdahl, Susan A. Zumdahl

Chapter16: Spontaneity, Entropy, And Free Energy

Section: Chapter Questions

Problem 51E: Consider the reaction 2O(g)O2(g) a. Predict the signs of H and S. b. Would the reaction be more...

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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.)
Two crystalline forms of white phosphorus are known. Both forms contain P4 molecules, but the molecules are packed together in different ways. The form is always obtained when the liquid freezes. However, below 76.9C, the form spontaneously converts to the form: P4(s,)P4(s,) a. Predict the signs of H and S for this process. b. Predict which form of phosphorus has the more ordered crystalline structure (has the smaller positional probability).
The reaction shown below is involved in the refining of iron. (The table that follows provides all of the thermodynamic data you should need for this problem.) 2Fe2O3(s)+3C(s,graphite)4Fe(s)+3CO2(g) (a) Find H for the reaction. (b) S for the reaction above is 557.98 J/K. Find S° for Fe2O3(s). (c) Calculate G for the reaction at the standard temperature of 298 K. (There are two ways that you could do this.) (d) At what temperatures would this reaction be spontaneous? Compound Hf (kJ mol-1) S° (kJ mol-1) Gf (J mol-1 K-1) Fe2O3(s) -824.2 ? -742.2 C(s, graphite) 0 5.740 0 Fe(s) 0 27.3 0 CO2(g) -393.5 213.6 -394.4.83
For the reaction at 298 K, 2NO2(g)N2O4(g) the values of H and S are 58.03 kJ and 176.6 J/K, respectively. What is the value of G at 298 K? Assuming that H and S do not depend on temperature, at what temperature is G = 0? Is G negative above or below this temperature?
Thermodynamics provides a way to interpret everyday occurrences. If you live in northern climates, one common experience is that during early winter, snow falls but then melts when it hits the ground. Both the formation and the melting happen spontaneously. How can thermodynamics explain both of these seemingly opposed events?
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How does the second law of thermodynamics explain a spontaneous change in a system that becomes more ordered when that process is exothermic?
Enthalpy changes often help predict whether or not a process will be spontaneous. What type of reaction is more likely to be spontaneous: an exothermic or an endothermic one? Provide two examples that support your assertion and one counterexample.
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?
The melting point for carbon diselenide (CSe2) is 46C. At a temperature of 75C, predict the signs for Ssurr and Swater for the following process: CSe2(l) CSe2(s).
A green plant synthesizes glucose by photosynthesis, as shown in the reaction: 6CO2(g) + 6H2O(l) C6H12O6(s) + 6O2(g) Animals use glucose as a source of energy: C6H12O6(s) + 6O2(g) 6CO2(g) + 6HO2(l) If we were to assume that both of these processes occur to the same extent in a cyclic process, what thermodynamic property must have a nonzero value?
Given the values of H and S, which of the following changes will be spontaneous at constant T and p? a. H = + 25 kJ, S = + 5.0 J/K, T = 300. K b. H = + 25 kJ, S = + 100. J/K, T = 300. K c. H = 10. kJ, S = + 5.0 J/K, T= 298 K d. H = 10.kJ, S =40.J/K, T = 200.K