The element oxygen was prepared by Joseph Priestley in 1774 by heating merc HgO(s) → Hg(I) + ½½0;(g), AH° = 90.84 kJ/mol. Estimate the temperature at which this reaction will become spontaneous und conditions. s°(Hg) = 76.02 J/K-mol s°(0;) = 205.0 J/K-mol S°(HgO) = 70.29 J/K-mol A. 108 K B. 430 K C. 620 K D. 775 K E. 840 K O AA O B. B Occ

The element oxygen was prepared by Joseph Priestley in 1774 by heating merc HgO(s) → Hg(I) + ½½0;(g), AH° = 90.84 kJ/mol. Estimate the temperature at which this reaction will become spontaneous und conditions. s°(Hg) = 76.02 J/K-mol s°(0;) = 205.0 J/K-mol S°(HgO) = 70.29 J/K-mol A. 108 K B. 430 K C. 620 K D. 775 K E. 840 K O AA O B. B Occ

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

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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3.
Consider the following reaction: SO((g) + CaO(s) = CasO4(s). If AGº is -345 kJ/mol for this reaction at 298K, what is the Keg at this temperature? Recall that R is 8.314 J mol-1 K-1. A) 3.1 x 1040 B) 3.50 x 1050 c) 2.96 x 1060 D 2.23 x 1070
The synthesis of the pesticide thionyl chloride (OSCI2) proceeds according to the following reaction: SO3(g) + SCI2(e) = OSCl2(e) + SO2(g) If AG° is -106 kJ/mol for this reaction at 298K, what is the Keg at this temperature? Recall that R is 8.314 J mol-1 K-1. A) 7.21 x 1012 B 3.50 x 1014 c) 3.81 x 1018 D) 1.19 x 1020
Determine the S'universe at 298 K for the reaction: 31.342 J/mol K 2NO(g) + 20z(g) → 2NO2(g) For the reaction, 4KCIO3(s) → 3KCIO«(s) + KCI(s) Calculate AGʻsys for the process at 298 K if AH'sys =144.3 kJ and AS'sys = -36.8 J/K. 133.33 kJ A key step in the production of sulphuric acid is the oxidation of SO2(g) + Oz(g) → 2SO3(g) At 98K, AGʻsys = - 500.51kJ; AH’sys = - 494.61. kJ; and AS'sys = -60.16 J/K a) Use the data to decide if this reaction is spontaneous at 25°, and predict how AG° will change with increasing T Reaction is spontaneous at lower temperature and vice versa b) Assuming AH´sys and AS'sys are constant with increasing T, is the reaction spontaneous at 900°C? Spontaneous
Be sure to answer all parts. For the gaseous reaction of carbon monoxide and chlorine to form phosgene (COCl₂), perform the following calculations. (a) Calculate the AS at 298 K (AH° = −220. kJ/mol and AG° = −206 kJ/mol). kJ/mol K (b) Assuming that AS and AH change little with temperature, calculate AG at 450. K. kJ/mol
Hint: No calculations are required. For the reaction 2HBr(g) + Cl2(g)- >2HCI(g) + Br2(g) AH° = -81.1 kJ and AS° =-1.20 J/K At standard conditions, this reaction would be product favored O at all temperatures. O at relatively high temperatures. O at no temperature. O at relatively low temperatures.
9) For which set of values of AH and AS will a reaction be non-spontaneous at 25°C? a) AH• = -10 kJ, AS = - 15 J b) AH• = - 10 kJ, AS= +5 J c) AH° = + 5 kJ, AS = +8J
Determine the AU°reaction at 25 °C (in kJ/mol) for the following reaction: 2NO(g) + O2(g)→2NO2(g) Appendix D kJ/mol
Given the values of AH, ASn, and T, determine ASuniy and predict whether or not each reaction is spontaneous. (Assume that all reactants and products are in their standard states.) a. AH = -95 kJ; AS;n = -157 J/K; T = 298 K b. AH = -95 kJ; AS"n = -157 J/K; T = 855 K Calculate the Gibbs free energy for the above sets (a) and (b)
Calculate H°rxnfor the following reaction and the given H°f of the reactants and products. A. 440 kJ B. -2440 kJ C. -440 kJ D. 1960 kJ
The value of AH° for the reaction below is -336 kJ. Calculate the heat (kJ) released to the surroundings when 23.0 g of HCl is formed. 26. CH4 (g) + 3Cl, (g) → CHC1; (1) + 3HC1 (g) A) B) C) 211 177 70.7 D) -336
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