Calculate the Eocell for: Zn(s) + Br2(g) Br-(aq) + Zn2+(aq) ; is this electrolyt

Question

Calculate the Eocell for: Zn(s) + Br2(g) Br-(aq) + Zn2+(aq) ; is this electrolytic or voltaic?

When a solid piece of copper is placed in a solution of SnCl2 will a reaction occur?

please help....

The balanced overall equation for: Au3+(aq) + Br-(aq) Au(s) + Br2(g)

Calculate the Eocell of: Au(s) ; Au3+(aq) || Mn2+(aq) ; Mn(s)    is this electrolytic or voltaic?

How many faradays is needed to "plate out" 100.0 g of chromium?

Calculate the Ecell of: Al(s) + Sn2+(aq)(0.010M) Al3+(aq)(1.0M) + Sn(s) (is this balanced?)

Explanation / Answer

1. Voltaic cell

2. Cu^2+/Cu resuction potential = +0.337 V , Sn^2+/Sn = -0.14 v

so that , Cu participates in reduction not in oxidation.

therefore reaction do not takes place.

3. overall equation for: 2Au3+(aq) + 6Br-(aq) 2Au(s) + 3Br2(g)

4. Eocell of: Au(s) ; Au3+(aq) || Mn2+(aq) ; Mn(s)

E0cell = 1.5 - -1.18 = 2.68 v

5.

E0cell = E0cathode - E0anode

       =   0.15- -1.66

   = 1.81 v

Ecell = 1.81- (0.0591/6)log((1)^2/(0.01)^3)

       = 1.751 v

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