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Calculate the standard e.m.f. of the rea...

Calculate the standard e.m.f. of the reaction
`Fe^(3+)+3e^(-)rarrFe_((s))`. Given the e.m.f. values of
`Fe^(3+)+e rarr Fe^(2+) and Fe^(2+)+2e rarr Fe_((s))" as "+0.771 V and =0.44V " respectively."`

Text Solution

Verified by Experts

Let `E_(1)=0.771V" for "Fe^(3+)+e rarr Fe^(2+)`
`E_(2)=0.44V" for "Fe^(2+)+2e rarr Fe_((s))`
then `E_(1)+E_(2)=0.331V` and this e.m.f. corresponds to
`Fe^(3+)+3e rarr Fe_((s)).`
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