Calculate the equilibrium constant for each of the reactions at 25°C.
a. 2Fe+3(aq) + 3Sn(s) → 2Fe(s) + 3Sn +2(aq)
b. O2(g) + 2H2O(l) + 2Cu(s) → 4OH-(aq) + 2Cu+2(aq)
c. Br2(l) + 2I-(aq) → 2Br-(aq) + I2(s)
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