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How many electrons would reflect in the ...

How many electrons would reflect in the nernst equation of the conversion of one mole of `Mn_3O_4` in the `MnO_2` ?

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The correct Answer is:
D
`Mn_3 O_4 overset(4e^(-)//4F) to 3MnO_2 + 4 , (4-(8)/(3)) xx 3 = (12.8 xx 3)/(3) =4 `
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