SOLVED

51) For the reaction:  CO(g) + 2 H2(g) → CH3OH(g) Kp = 91.4 at 350 K and Kp = 2.05 × 10-4 at 298 K. What is the value of ΔH°? A) 49.9 kJ/mol B) 2.08 × 103 kJ/mol C) 3.74 × 10-2 kJ/mol D) 217 kJ/mol E) 446 kJ/mol 52) Choose the INCORRECT statement about coupled reactions. A) The usual practice of coupling reactions is to join two nonspontaneous reactions. B) The usual reason to couple reactions is to produce an overall spontaneous reaction. C) The reaction added to a nonspontaneous reaction needs to be spontaneous. D) The reaction added to a nonspontaneous reaction needs to be more spontaneous than the original reaction is nonspontaneous. E) One of the coupled reactions has a negative ΔG, the other a positive ΔG. 53) Which of the listed reactions would couple with the following reaction to produce silver? Ag2O(s) → 2 Ag(s) + 1/2 O(g)ΔG° = 11.2 kJ/mol A) Ag(s) + 1/2 Br2 → AgBr(s)ΔG° = 96.9 kJ/mol B) C + 1/2 O2 → COΔG° = -137.2 kJ/mol C) N + 1/2 O2 → NOΔG° = 149.3 kJ/mol D) N + O2 → NO2ΔG° = 51.3 kJ/mol E) C + 2 S → CS2(l)ΔG° = 65.3 kJ/mol 54) Order the following by increasing entropy. CO(g), COCl2(g), CO2(g), CaO(s) A) CO2 < CO < CaO < COCl2 B) CaO < CO < CO2 < COCl2 C) COCl2 < CO < CaO < CO2 D) CO2 < CaO < COCl2 < CO E) CO < CaO < COCl2 < CO2 55) Predict whether ΔS is positive or negative for the following process: H2(g) + 1/2 O2(g) →    H2O(g) A) negative B) positive C) There is not enough information to determine. D) ΔS doesn't change. E) ΔS changes the same on both sides of the equation. 56) Predict whether ΔS is positive or negative for the following process: 2 Cl2O7(g) → 2 Cl2(g) + 7 O2(g) A) negative B) positive C) There is not enough information to determine. D) ΔS doesn't change. E) ΔS changes the same on both sides of the equation. 57) Predict whether ΔS is positive or negative for the following process: H2O(g) → H2O(s) A) negative B) positive C) There is not enough information to determine. D) ΔS doesn't change. E) ΔS changes the same on both sides of the equation. 58) For the reaction, N2O4(g) → 2 NO2(g) S° (J/mol K) 304.2240.0 what is ΔS°rxn? A) 544.2 J/mol ? K B) -64.2 J/mol ? K C) 175.8 J/mol ? K D) -175.8 J/mol ? K E) 64.2 J/mol ? K 59) For the reaction,CaCO3(s) → CaO(s) + CO2(g) S° (J/mol K)              88.7039.75213.6 what is ΔS°rxn? A) 262.5 J/mol ? K B) -85.1 J/mol ? K C) -164.7 J/mol ? K D) 164.7 J/mol ? K E) 85.1 J/mol ? K 60) For the reaction, CO(g) + 2H2(g) → CH3OH(g) S° (J/mol K)             197.6130.6239.7 what is ΔS°rxn? A) -88.5 J/mol ? K B) -176.7 J/mol ? K C) 219 J/mol ? K D) 176.7 J/mol ? K E) -219.1 J/mol ? K