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

Question

The standard cell potential (E degree_cell) for the voltaic cell based on the reaction below is V. Sn^2+ (aq) + 2 Fe^3+ (aq) rightarrow 2Fe^2+ (aq) + Sn^4+ (aq) +0.46 +1.21 +1.39 -0.46 +0.617 Determine the number of electrons transferred during the reaction (when balanced). (AuCl_4)^- (aq) + Cu(s) rightarrow Au(s) + Cl^- (aq) + Cu^2= (aq) 9 3 4 6 2 If a constant current of 5.0 amperes is passed through a cell containing Cr^3+ for 1.0 hour, how many grams of Cr will plate out onto the cathode? (The atomic mass of Cr is 51.996.) 3.2 g 9.0 times 10^-4 g 6.2 times 10^-2 g 29 g 9.7 g

Explanation / Answer

Q33

split half reaction

Sn+2 = Sn+4

Fe+3 = Fe+2

Find E°cell for each

Sn+4 --> Sn+2 is E = 0.154 so invert it to E = -0.154

this is

Fe+3 = Fe+ E =0.771

Add all values

E°cell = 0.771 -0.154 = 0.617 V

choose E

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