Homework Answers
Change in gibbs free energy ,delta G has NEGATIVE.
a) Change in entropy ,delta S has POSITIVE.
b) standard reduction potential of reaction, E0 has POSITIVE
These two factors are necessary for an endothermic process to be spontaneous.
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Two factors are necessary for an endothermic process to be spontaneous (to have a negative AG). What are they? a) 2. b) Two factors are necessary for an endothermic process to be spontaneous...
What can be said about an Endothermic reaction with a negative entropy change? The reaction is a. spontaneous at al...
What can be said about an Endothermic reaction with a negative entropy change? The reaction is a. spontaneous at all temperatures. b. spontaneous at high temperatures. c. spontaneous at low temperatures. d. spontaneous in the reverse direction at all temperatures. e. nonspontaneous in either direction at all temperatures. What can be said about an Exothermic reaction with a negative entropy change? The reaction is a. spontaneous at all temperatures. b. spontaneous at high temperatures. c. spontaneous at low temperatures. d....
What can be said about an endothermic reaction with a negative entropy change? The reaction is What can be...
What can be said about an endothermic reaction with a negative entropy change? The reaction is What can be said about an endothermic reaction with a negative entropy change? spontaneous at all temperatures. spontaneous at high temperatures. spontaneous at low temperatures. spontaneous in the reverse direction at all temperatures. nonspontaneous in either direction at all temperatures. Part B What can be said about an exothermic reaction with a negative entropy change? The reaction is What can be said about an...
What is the cathode reaction for the spontaneous process associated with this voltaic cell? Ag^+(aq) +...
What is the cathode reaction for the spontaneous process associated with this voltaic cell? Ag^+(aq) + e^- rightarrow Ag(s) Fe^2+(aq) + 2e^- rightarrow Fe(s) Ag(s) rightarrow Ag^+(aq) + e^- Fe(s) rightarrow Fe^2+(aq) + 2e^-
8) For a reaction with a negative AG value, which of the following statements is always...
8) For a reaction with a negative AG value, which of the following statements is always true? A) The reaction is always spontaneous in the forward direction. B) The reaction is always spontaneous in the reverse direction. C) The reaction is always exothermic. D) The reaction is always endothermic. E) AG is always a constant Answer: (
A process at constant T and P can be described as spontaneous if AG <0 and...
A process at constant T and P can be described as spontaneous if AG <0 and nonspontaneous if AG> 0. Over what range of temperatures is the following process spontaneous? Assume that gases are at a pressure of 1 atm. (Hint: Use the data below to calculate AH and AS [assumed independent of temperature and equal to AH° and AS°, respectively] and then use the definition of AG.) 2 MnO2(s) 02(g) 2 MnO(s) AH (kJ mol) -520.0 -385.2 s° (J...
Gibbs free energy change AG is defined as AG= AH-TAS. For a spontaneous process, AG<0. For...
Gibbs free energy change AG is defined as AG= AH-TAS. For a spontaneous process, AG<0. For a. reversible reaction at equilibrium, AG = 0. The equilibrium constant K of the reversible reaction is relate- AG"=-RTIn(K). Symbol 40" refers to thermodynamics standard condition: 298 K and 1 atm. Exercise:consider the following reaction: bo:pfoiex 2 HNO:(aq)+NO(g)- 3 NO2(g) + H2O(I) AH=+136.5 kJ; AS = +287.5 J/K a. Below what temperature does the following reaction becomes nonspontaneous? niliod sis anotsole s ob io...
What can be said about an endothermic reaction with a negative entropy change? The reaction is What can be said about...
What can be said about an endothermic reaction with a negative entropy change? The reaction is What can be said about an endothermic reaction with a negative entropy change? spontaneous at all temperatures. spontaneous at high temperatures. spontaneous at low temperatures. spontaneous in the reverse direction at all temperatures. nonspontaneous in either direction at all temperatures.
2) AH corresponds to an process. a) negative, exothermic b) negative, endothermic c) positive, exothermic d)...
2) AH corresponds to an process. a) negative, exothermic b) negative, endothermic c) positive, exothermic d) zero, exothermic none of these is correct e) 3) Which one of the following processes is exothermic? 2H2 (g) + O2 (g) C2H2 (I) a) 2H2O (g) b) C2H2 (g) c) CO2 (g) +2H2O (g) d) C2H2 (s) None of these e) CH4 (g) +202 (g) C2H2 (I)
Part 2. (10pt) Determine AG for the above spontaneous (irreversible) process (with 3.0 mol of water...
Part 2. (10pt) Determine AG for the above spontaneous (irreversible) process (with 3.0 mol of water at 1 atm): H2O (liquid, -15 °C) → H2O (solid, -15 °C) 2. (40pt) 2.0-mole ideal gas with molar heat capacity Cy.m - 5R/2 undergoes the following two processes, as shown in the P-V diagram on right. Process 1: A to B (A linear decreasing function) Process 2: B to C (constant pressure) Process 3: C to A (constant volume) Determine 4, W, AU,...
Part 2. (10pt) Determine AG for the above spontaneous (irreversible) process (with 3.0 mol of water...
Part 2. (10pt) Determine AG for the above spontaneous (irreversible) process (with 3.0 mol of water at 1 atm): H2O (liquid, -15 °C) → H2O (solid, -15 °C) 2. (40pt) 2.0-mole ideal gas with molar heat capacity Cv.m = 5R/2 undergoes the following two processes, as shown in the P-V diagram on right. Process 1: A to B (A linear decreasing function) Process 2: B to C (constant pressure) Process 3: C to A (constant volume) Determine q, w, AU,...
What is the cathode reaction for the spontaneous process associated with this voltaic cell? Ag^+(aq) + e^- rightarrow Ag(s) Fe^2+(aq) + 2e^- rightarrow Fe(s) Ag(s) rightarrow Ag^+(aq) + e^- Fe(s) rightarrow Fe^2+(aq) + 2e^-
8) For a reaction with a negative AG value, which of the following statements is always true? A) The reaction is always spontaneous in the forward direction. B) The reaction is always spontaneous in the reverse direction. C) The reaction is always exothermic. D) The reaction is always endothermic. E) AG is always a constant Answer: (
A process at constant T and P can be described as spontaneous if AG <0 and nonspontaneous if AG> 0. Over what range of temperatures is the following process spontaneous? Assume that gases are at a pressure of 1 atm. (Hint: Use the data below to calculate AH and AS [assumed independent of temperature and equal to AH° and AS°, respectively] and then use the definition of AG.) 2 MnO2(s) 02(g) 2 MnO(s) AH (kJ mol) -520.0 -385.2 s° (J...
Gibbs free energy change AG is defined as AG= AH-TAS. For a spontaneous process, AG<0. For a. reversible reaction at equilibrium, AG = 0. The equilibrium constant K of the reversible reaction is relate- AG"=-RTIn(K). Symbol 40" refers to thermodynamics standard condition: 298 K and 1 atm. Exercise:consider the following reaction: bo:pfoiex 2 HNO:(aq)+NO(g)- 3 NO2(g) + H2O(I) AH=+136.5 kJ; AS = +287.5 J/K a. Below what temperature does the following reaction becomes nonspontaneous? niliod sis anotsole s ob io...
2) AH corresponds to an process. a) negative, exothermic b) negative, endothermic c) positive, exothermic d) zero, exothermic none of these is correct e) 3) Which one of the following processes is exothermic? 2H2 (g) + O2 (g) C2H2 (I) a) 2H2O (g) b) C2H2 (g) c) CO2 (g) +2H2O (g) d) C2H2 (s) None of these e) CH4 (g) +202 (g) C2H2 (I)
Part 2. (10pt) Determine AG for the above spontaneous (irreversible) process (with 3.0 mol of water at 1 atm): H2O (liquid, -15 °C) → H2O (solid, -15 °C) 2. (40pt) 2.0-mole ideal gas with molar heat capacity Cy.m - 5R/2 undergoes the following two processes, as shown in the P-V diagram on right. Process 1: A to B (A linear decreasing function) Process 2: B to C (constant pressure) Process 3: C to A (constant volume) Determine 4, W, AU,...
Part 2. (10pt) Determine AG for the above spontaneous (irreversible) process (with 3.0 mol of water at 1 atm): H2O (liquid, -15 °C) → H2O (solid, -15 °C) 2. (40pt) 2.0-mole ideal gas with molar heat capacity Cv.m = 5R/2 undergoes the following two processes, as shown in the P-V diagram on right. Process 1: A to B (A linear decreasing function) Process 2: B to C (constant pressure) Process 3: C to A (constant volume) Determine q, w, AU,...
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