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You are given the following three half-reactions: (1) Fe3+(aq) + e− → Fe2+(aq) E = +0.77 V (2) Fe2+(aq) + 2e− → Fe(s) E= −0.44 V (3) Fe3+(aq) + 3e− → Fe(s) Calculate ΔG for (3) from (1) and (2).