Question

a. For spontaneous chemical process involving oxidation/reduction chemistry the overall cell potential, E, needs to be......

a. For spontaneous chemical process involving oxidation/reduction chemistry the overall cell potential, E, needs to be...

1) Positive
2) Negative
3) Zero
4) It Depends

b. Briefly explain your answer to part a.

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Homework Answers

Answer #1

a) answer : 1) Positive

b) explanation:

if Ecell is positive than the delta G value will be negative .

for spontaneous reaction the deltaG value always negative

if delta G negative equilibrium constant value always postiive

these are the conditions for spontaneous reaction

for example , the galvanic cell Zn + Cu+2 ---------------> Zn+2 + Cu

oxidation half cell : Zn --------------> Zn+2 + 2e-     , Eo = -0.76 V

reduction half cell : Cu+2 + 2e- ---------------> Cu , Eo = +0.34 V

overall cell potential = Eocell = Eo cathode - Eo anode = 0.34 + 1.76 = 1.10 V

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