Use the standard reduction potentials to find the equilibrium constant for each of the following reactions at 25°c.
(a) 5 fe2+(aq) + mno4? (aq) + 8 h+(aq) < > mn2+(aq) + 4 h2o(l) + 5 fe3+(aq)
(b) 2 ce4+(aq) + 2 cl ? (aq) < > cl2(g) + 2 ce3+(aq)
(c) br2(l) + 2 i ? (aq) < > 2 br? (aq) + i2(s)