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What is the value of the equilibrium constant at 25°C for the reaction between each of...

What is the value of the equilibrium constant at 25°C for the reaction between each of the following?

(a) Al(s) and Cd2+(aq)

(b) Cr(s) and Cu2+(aq)

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Answer #1

   2 Al ---------->2 Al+3 + 6e-    E0 = 1.66V

   3Cd+2 + 6e- ------> 3Cd              E0   = 0.40V

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2Al(s) + 3Cd+2 (aq) ------> 2Al+3 + 3Cd    E0 = 2.06v

G0   = -nE0 cell*F

             = -6*2.06*96500 = -1192740J

G0    = -RTlnK

-1192740 = -8.314*298*2.303logK

logK   = 1192740/5705.8483    = 209

K = 10209

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