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ELECTROCHEMICAL STOICHIOMETRY
Cells: Stoichiometry ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],ELECTROCHEMICAL STOICHIOMETRY
Example #1 ,[object Object],I = 300kA = 300000A t = 24h  x  3600s 1h = 8.6x10 4 s  q = It q = (300000A)(8.6x10 4 s) q = 2.6x10 10 C .: the charge transferred is 2.6x10 10 C ELECTROCHEMICAL STOICHIOMETRY
Cells:  Stoichiometry ,[object Object],[object Object],[object Object],ELECTROCHEMICAL STOICHIOMETRY
Cells:  Stoichiometry ,[object Object],[object Object],[object Object],[object Object],ELECTROCHEMICAL STOICHIOMETRY
Example #2 ,[object Object],t = 1.5h x 3600s/h t = 4.50x10 3 s n e-  =  It F n e-  =  (0.150A)(4.50x103s)   (9.65x10 4 c/mol) n e-  = 6.99x10 -3  mol .: 6.99x10 -3  mol of electrons is transferred ELECTROCHEMICAL STOICHIOMETRY
Example #3 ,[object Object],Cr 2+ (aq)  + 2e -     Cr (s) n e-  =  It F n e-  =  (12.0A)(2400s) (9.65x10 4 c/mol) t = 40.0min x 60s/min t = 2400s n e-  = 0.298 mol e - 2 mol e -  =  0.298 mol e - 1 mol Cr   x  mol Cr x  = 0.149 mol Cr m = n x M m = (0.149)(52g/mol) m = 7.75g .: m = 7.75g ELECTROCHEMICAL STOICHIOMETRY
Example #4 ,[object Object],Ag + (aq)  + e -     Ag (s) n =  m M n =  (0.175g) (108g/mol) n = 1.62x10 -3  mol 1 mol Ag   =  1.62x10 -3  mol Ag 1 mol e -     x  mol e - x  = 1.62x10 -3  mol e - t = 10.0min x 60s/min t = 600s n e-  =  It F I =  n e- F t I =  (1.62x10 -3 mol)(9.65x10 4 C/mol) (600s) I = 0.261A .: the current is 0.261A ELECTROCHEMICAL STOICHIOMETRY

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Tang 05 electrochemical stoichiometry 2