Chemistry
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ISBN: 9781305957404
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Transcribed Image Text:Use data given below to calculate A,S° for each of the
reactions.
Standard Thermodynamic Quantities for Selected
Substances at 25 ° C
Substance
A‚S°,J K-1 mol-1
Fe (s)
27.3
Fe2 O3 (s)
CO (g)
87.4
197.7
CO2 (g)
213.8
На (9)
130.7
H2O (g)
H2O (1)
188.8
70.0
HNO3 (aq)
146.0
N2 (g)
191.6
N204 (9)
304.4
NO (g)
210.8
NO2 (g)
240.1
O2 (g)
KC103 (s)
KC104 (8)
205.2
143.1
151.0
Transcribed Image Text:KC1O; (s) + 02 (9) → KC1O4 (8)
Express your answer using one decimal place.
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- Consider the reaction CS2 (9) + 4H2 (9) = CH4 (9) + 2H2S(g) a. Calculate AH°, AS“ , and AG° at 25°C for this reaction. AĦ¡ (kJ/mol) S° (J/mol-K) CS2 (9) H2 (9) CH4 (9) H2S(9) 116.9 237.9 130.6 -74.87 186.1 -20.50 205.6 ΔΗ : kJ %3! AS J/K AG° kJ b. Assume AH° and AS° are constant with respect to a change of temperature. Now calculate AG° at 250°C. AG = kJ c. Compare the two values of AG". What can you say about the spontaneity of the reaction at 25°C and at 250°C? The reaction will be spontaneous at 25°C, and it will be nonspontaneous at 250°C. The reaction will be nonspontaneous at 25°C, and it will be spontaneous at 250°C. The reaction will be spontaneous at both 25°C and 250°C. The reaction will be nonspontaneous at both 25°C and 250°C.arrow_forwardSolve the following problems. Write your solution and box your final answer.arrow_forwardThe below reaction was found to have AH :-491 kJ mol-1 and AS = -543 J mol-1 K-1. What is AG for this reaction at 117.9 °C? 2Fe(s) + 3CO(g) → Fe2O3(s) + 3C(s) a. -427 kJ mol-1 b. -703 kJ mol-1 c. 211849 kJ mol-1 d. 52 kJ mol-1 e. -279 kJ mol-1arrow_forward
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- Use the data given here to calculate the values of AGn at 25 °C for the Compound AG; (kJ/mol) reaction described by the equation A +387.7 A + B 2C B - 596.8 C +402.0 543.1 AGixn kJ Incorrect If AHxn and ASxn are both negative values, what drives the spontaneous reaction and in what direction at standard conditions? The spontaneous reaction is enthalpy-driven to the left. entropy-driven to the right. entropy-driven to the left. O enthalpy-driven to the right. Incorrect O O O Oarrow_forward[Review Topics] [References] Use the References to access important values if needed for this question. A student determines the value of the equilibrium constant to be 1.21x1012 for the following reaction. CO(g) + Cl2(g)- COC12(g) Based on this value of Keg AG° for this reaction is expected to be (greater,less) than zero. Calculate the free energy change for the reaction of 1.65 moles of CO(g) at standard conditions at 298K. AG rxn kJarrow_forwardTrue or false? Why?arrow_forward
- Use standard thermodynamic data (in the Chemistry References) to calculate AG at 298.15 K for the following reaction, assuming that all gases have a pressure of 19.35 mm Hg. 2NO(g) + 02(g)→2NO2(g) AG = kJ/molarrow_forwardTrue or false and how?arrow_forwardConsider the reaction 12(g) + Cl₂(g) 2ICI(g) Use the standard thermodynamic data in the tables linked above. Calculate AG for this reaction at 298.15K if the pressure of ICI(g) is reduced to 16.66 mm Hg, while the pressures of l2(g) and Cl₂(g) remain at 1 atm. kJ/mol ANSWER: (Please type answer).arrow_forward
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