Use the following half-reactions to write three spontaneousreactions, and calculate E cell for each reaction:
a. Au+ (aq) + e- ----> Au (s) E= 1.69V
b. N2O (g) + 2H+ (aq) + 2 e-----> N2 (g) + H2O (l) E= 1.77 V
c. Cr3+ (aq) + 3e- ---> Cr (s) E= -0.74V
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