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Ag*(aq) + 2 NH3(aq) = Ag(NH3)2**(aq) For this reaction, K = 1.7 x 107 at 25°C. What is the value of AG° in kJ? (A) – 41.2 (B) – 17.9 (C) + 17.9 (D) + 41.2

Ag*(aq) + 2 NH3(aq) = Ag(NH3)2**(aq) For this reaction, K = 1.7 x 107 at 25°C. What is the value of AG° in kJ? (A) – 41.2 (B) – 17.9 (C) + 17.9 (D) + 41.2

Introduction to Chemical Engineering Thermodynamics
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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Ag"(aq) + 2 NH3(aq) Ag(NH3)2**(aq) For this reaction, K = 1.7 x 107 at 25°C. What is the value of AG° in kJ? (A) - 41.2 (В) — 17.9 (C) + 17.9 (D) + 41.2 What is the sign of AG" and the value of K for an electrochemical cell for which E -0.80 V? AG" K (A) >1 (В) + >1 (C) + < 1 (D) < 1 The decomposition of ethane into two methyl radicals has a first order rate constant of 5.5 x 10-4 sec1 at 700°C. What is the half-life for this decomposition in minutes? (A) 9.1 (B) 15 (C) 21 (D) 30 Silver ions are added to a solution with [Br]= [CH]=[CO,²]=[AsO,'] =0.1 M. Which compound will precipitate at the lowest [Ag ]? (K, = 5.0 × 10-") (K„ – 1.8 x 10-") (A) AgBr (B) AgCl (C) Ag,CO, (K„ - 8.1 x 10-1) (D) Ag,AsO, (K„ = 1.0 × 10 ")
Transcribed Image Text:Ag"(aq) + 2 NH3(aq) Ag(NH3)2**(aq) For this reaction, K = 1.7 x 107 at 25°C. What is the value of AG° in kJ? (A) - 41.2 (В) — 17.9 (C) + 17.9 (D) + 41.2 What is the sign of AG" and the value of K for an electrochemical cell for which E -0.80 V? AG" K (A) >1 (В) + >1 (C) + < 1 (D) < 1 The decomposition of ethane into two methyl radicals has a first order rate constant of 5.5 x 10-4 sec1 at 700°C. What is the half-life for this decomposition in minutes? (A) 9.1 (B) 15 (C) 21 (D) 30 Silver ions are added to a solution with [Br]= [CH]=[CO,²]=[AsO,'] =0.1 M. Which compound will precipitate at the lowest [Ag ]? (K, = 5.0 × 10-") (K„ – 1.8 x 10-") (A) AgBr (B) AgCl (C) Ag,CO, (K„ - 8.1 x 10-1) (D) Ag,AsO, (K„ = 1.0 × 10 ")
Galvanic Cell Cell Diagram E°cell (Volts) Mg | Mg"(1.0 M) || Pb*?(1.0 M) | Pb 1 2.24 2 Zn | Zn*2(1.0 M) || Pb*2(1.0 M) | Pb 0.63 3 Mg | Mg*(1.0 M) || Zn*(1.0 M) | Zn The chemical reaction occurring in first galvanic cell is: Mg + Pb+2 → Mg*2 + Pb if the concentration of Mg*2 is changed from 1.0 M to 3.0 M in the galvanic cells above, what will happen to the observed cell voltages in galvanic cells 1 and 3? (A) The voltage in both galvanic cells 1 and 3 will increase. (B) The voltage will decrease in both galvanic cells 1 and 3. (C) The voltage in galvanic cell 1 will increase and will decrease in galvanic cell 3 (D) The voltage in galvanic cell 3 will increase and will decrease in galvanic cell 1. Consider a voltaic cell based on these half-cells. E* = +0.80 V Ag (aq) +e → Ag(s) Cd"(aq) + 2e → Cd(s) E =-0.40 V Identify the anode and give the voltage of this cell under standard conditions. (A) Ag; Ecell = 0.40 V (B) Ag; Ecell = 2.00 V (C) Cd; Ecell = 1.20 V (D) Ag; Ecell = 2.00 V
Transcribed Image Text:Galvanic Cell Cell Diagram E°cell (Volts) Mg | Mg"(1.0 M) || Pb*?(1.0 M) | Pb 1 2.24 2 Zn | Zn*2(1.0 M) || Pb*2(1.0 M) | Pb 0.63 3 Mg | Mg*(1.0 M) || Zn*(1.0 M) | Zn The chemical reaction occurring in first galvanic cell is: Mg + Pb+2 → Mg*2 + Pb if the concentration of Mg*2 is changed from 1.0 M to 3.0 M in the galvanic cells above, what will happen to the observed cell voltages in galvanic cells 1 and 3? (A) The voltage in both galvanic cells 1 and 3 will increase. (B) The voltage will decrease in both galvanic cells 1 and 3. (C) The voltage in galvanic cell 1 will increase and will decrease in galvanic cell 3 (D) The voltage in galvanic cell 3 will increase and will decrease in galvanic cell 1. Consider a voltaic cell based on these half-cells. E* = +0.80 V Ag (aq) +e → Ag(s) Cd"(aq) + 2e → Cd(s) E =-0.40 V Identify the anode and give the voltage of this cell under standard conditions. (A) Ag; Ecell = 0.40 V (B) Ag; Ecell = 2.00 V (C) Cd; Ecell = 1.20 V (D) Ag; Ecell = 2.00 V
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