Mastering Chemistry: Chapter 20-Google Chrome Secure https: CHEM 1120-001 Spring

Question

Mastering Chemistry: Chapter 20-Google Chrome Secure https: CHEM 1120-001 Spring 2017 Chapter 20 Exercise 20.64 Exercise 20.64 Calculate the equilibrium constant for each of the reactions at 25 C O Ask me anything Part B 2-t O2 (g) 2 H20 +2 Sn 4 OH (ag) 2 Sn (ag) Express your answer using two significant figures. My Answers Give Up Submit Part C 2 Crsi (ag) 3 Ni(s) 2 Cr(s) 3 Ni (ag) Express your answer using two significant figures. K 2.1x10 51 Submit My Answers Give Up Correct Help Close Resources ious 8 of 11 l next Provide Feedback Continue 2:15 AM A 4/18/2017

Explanation / Answer

part B)

oxidation : 2 Sn+2   -------------> 2 Sn+4 + 4 e-    Eo = 0.151 V

Reduction : O2 + 4e- ------------> 4 OH-               Eo = 0.401V

Eocell = Eored - Eooxid

           = 0.401 - 0.151

           = 0.25 V

delta Go = - n F Eocell x 10^-3

              = - 4 x 96485 x 0.25 x 10^-3

               = - 96.485 kJ /mol

delta Go = - R T ln K

- 96.485 = - 8.314 x 10^-3 x 298 x ln K

K = 8.2 x 10^16

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