Please explain your answer! What is the balanced spontaneous reaction and standa

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Please explain your answer!

What is the balanced spontaneous reaction and standard cell potential of an electrochemical cell constructed from half cells with the following half reactions? Zn2+(aq) + 2e- rightarrow Zn(s) E degree = -0.763 V Pb2+ (aq) + 2e- rightarrow Pb(s) E degree = -0. 130 V Pb(s) + Zn2+(aq) rightarrow Pb2+(aq) + Zn(s); -0.633 V Pb2+(aq) + Zn(s) rightarrow Pb(s) + Zn(s); - 0.893 V Pb2+(aq) + Zn(s) rightarrow Pb(s) + Zn2+(aq); 0.317 V Pb(s) + Zn2+(aq) rightarrow Pb2+(aq) + Zn(s); -0.317 V

Explanation / Answer

Pb2+ will oxidise Zn to Zn2+ and Pb2+ will be reduced to Pb.

Balanced equation :

Pb 2+ (aq) + Zn (s) <------> Zn2+ (aq)    + Pb(s)

E0cell = E0cathode + E0anode

         = 0.763 + (-0.13)

         = +0.633

correct answer : D

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