1) The standard cell potential ( E o cell ) for the voltaic cell based on the re

Question

1) The standard cell potential (Eocell) for the voltaic cell based on the reaction below is _____ V.

Sn2+ (aq) + 2Fe3+ (aq) ------> 2Fe2+ (aq) + Sn4+ (aq)

A) +0.617 B) +1.39 C) +0.46 D) +1.21 E) -0.46

2) Use the standard half-cell potentials listed below to calculate the standard cell potential for the following reaction occurring in an electrochemical cell at 25 degrees C. (The equation is balanced.)

3 Cl2 (g) + 2 e- -----> 2 Cl- (aq) Eocell = +1.36 V

Fe3+ (aq) + 3e- ------> Fe (s) Eocell = - 0.04 V

A) -1.32 V B) +1.40 V C) +1.32V D) -1.40V E) +4.16V

Explanation / Answer

Sn+2 + 2e- --> Sn4+ E = +0.15

2Fe3+ --> 2Fe2+ + 2e- E = -0.77

E = Ered - Eox = +0.15 -- 0.77 = 0.62

E= 0.62

2)

3 Cl2 (g) + 2 e- -----> 2 Cl- (aq) Eocell = +1.36 V

Fe3+ (aq) + 3e- ------> Fe (s)   Eocell = - 0.04 V

Therefore:

3 Cl2 (g) + 2 e- -----> 2 Cl- (aq) Eocell = +1.36 V

Fe (s) ------> Fe3+ (aq) + 3e-   Eocell = + 0.04 V

E = Ered + Eox = 1.36 + 0.04 = 1.40 V

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