Calculate the Ecell of: Al(s) + Pd2+(aq)(0.010M) Al3+(aq)(1.0M) + Pd(s) (is this

Question

Calculate the Ecell of: Al(s) + Pd2+(aq)(0.010M) Al3+(aq)(1.0M) + Pd(s) (is this balanced?)

A. 2.43 B. -2.55 C. 2.55

Calculate the Eocell for: Au + Br2(g) Au3+(aq) + Br-(aq) ; is this electrolytic or volatic A. 0.42V electrolytic B. 0.42V voltaic C. -0.42V voltaic D. -0.42V electrolytic

Calculate the Eocell of: Au(s) ; Au3+(aq) || Sn2+(aq) ; Sn(s) is this electrolytic or voltaic? A. 1.64 ; voltaic B. -1.64 ; voltaic C. 1.64 ; electrolytic D. -1.64 ; electrolytic

How many faradays is needed to "plate out" 100.0 g of gold? A. 1.5 B. 1.5 x 105 C. 1.6 x 10-5 When a solid piece of tin is placed in a solution of CuCl2 a reaction will occur T F

Explanation / Answer

Part A) For, 2Al(s) + 3Pd2+ ---> 2Al3+(aq) + 3Pd(s)

Ecell = Eo - 0.0592/n logK

         = (0.987 - (-1.66)) - 0.0592/6 log(1/0.01^3)

         = 2.58 V

Answer : C. 2.55 V

Part B) Eocell = Ecathode - Eanode = -0.42 V

Answer : D. -0.42 V, electrolytic

Part C) Eocell = -1.64 V

Answer : D. -1.64, electrolytic

Part D) moles of Au = 100 g/196.9666 g/mol = 0.51 mols

Faradays needed = 0.51 x 96485 x 3 = 1.5

Answer : A. 1.5

Part E) When a solid piece of Tin in olaced in aqueous CuCl2, reaction will occur : T

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