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A cell can be prepared from copper and tin, What is the Ecell for the galvanic cell that forms from the following half-reactions? Cu2+(aq) + 2e- == Cu(s) E=0.34 V Sn4+(aq) + 2e- == Sn2(aq) E=0.13V 0.47V 0.21V -0.21V -0.47V 0.42V