x What are t CHEM 2 LP abs net 8 Sousa The Stars and NS Timeline: Weapons to 4 E

Question

x What are t CHEM 2 LP abs net 8 Sousa The Stars and NS Timeline: Weapons to 4 Easy Ways to Cite a Mvocabulary.com Lu 6. Under standard-state conditions, what spontaneous reaction will occur in aqueous solution among the ions Cei Ces Fe and Fe Calculate AG and K for this reaction. (8 points) (Reference: Chang 18.27) 7. What is the potential of a cell made up of znZn" and Cu/Cu half-cells at 25°C if [zn T] 0.25 Mand [Cu 0.15 M (8 points) (Reference: Chang 18.31) 8. Consider the electrolysis of molten barium chloride, Bacl,. (a) Write the halfreactions. (b) How many grams of barium metal can be produced by supplying Copyright o 2016 by Thomas Edison State University. All rights reserved.

Explanation / Answer

(6)

Ce4+ + e- <===> Ce3+       E0 = +1.61 v

Fe3+ + e <====> Fe2+ E0 = +0.77 V

electrochemical reaction :

Fe^2+ + Ce^4+    ----> Ce^3+ + Fe^3+

DG0 = -nFE0cell

E0cell = 1.61-0.77 = 0.84 V

DG0 = -1*96500*0.84

    = -81060 joule.

DG0 = -RTlnK

-81060 = -8.314*273lnK

k = 3.24*10^15

(7)

Zn2+(aq) + 2e-   ---------> Zn(s) ; E0cell = -0.76 V ............(1)

Cu2+(aq) + 2e-   ---------> Cu(s) ; E0cell = 0.34 V ............(2)

Now, overall reaction :-

Cu2+(aq) + Zn(s) -----------> Zn2+(aq) + Cu(s) ; E0cell = 0.34 - (-0.76) = 1.1 V

Now, as per Nernst Equation:-

E = E0 - (0.06/n)*log{[Zn2+]/[Cu2+]} , where n = 2

E = 1.1 - (0.03)*log(0.25/0.15)

= 1.093 V

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