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Based on the half-reactions and their respective standard reduction potentials below, what is the standard cell potential for the reaction that is expected to occur?
Fe3+(aq) + e- → Fe2+(aq) 0.77 V
Sn4+(aq) + 2 e- → Sn2+(aq) 0.15 V
Pb2+(aq) + 2 e- → Pb(s) -0.13 V
Answers:
0.64 V
0.90 V
0.28 V
1.03 V

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  2. I don't get the question because there are three possible answers but apparently only one question.
    Fe3+(aq) + e- → Fe2+(aq) 0.77 V
    Sn2+(aq) ==> Sn4+(aq) + 2 e- - 0.15 V
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    add the two and E = 0.77 - 0.15 = + 0.62
    One possible reaction but 0.62 is not a possible answer.

    Do the same for equations 1 and 3 (turn 3 around) to get E = 0.77 + 0.13 = + 0.9. Reaction is possible and this answer is one of the choices.

    Do the same for equations 2 and 3 (turn 3 around) to get E = 0.15 + 0.13 = 0.28. Another possible reaction and this is one of the choices.
    Hope this helps you with whatever the question happens to be.

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    DrBob222

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