InterviewSolution
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InterviewSolution
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The standard oxidation potential for `Mn^(3+)` ion acid solution are `Mn^(2+)overset(-1.5V)rarrMn^(3+) overset(-1.0V)rarr MnO_(2)`. Is the reaction `2Mn^(3+)+2H_(2)O rarr Mn^(2+)+MnO_(2)+4H^(+)` spontaneous under conditions of unit activity ? What is the change in free energy ?A. spontaneous ,`-48250J`B. nonspontaneous, `+48250J`C. no change in free energyD. spontaneous , `-96500J` |
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Answer» Correct Answer - 1 `DeltaG=DeltaG^(@)+2.303RTlogQ` `Q=1("activity"=1)` `DeltaG=DeltaG^(@)` `Mn^(+3)+e^(-)rarrMn^(+2)" "DeltaG_(1)^(@)=-1xxFxx1.5` `Mn^(+3)+2H_(2)OrarrMnO_(2)+4H^(+)+e^(-)" "DeltaG_(2)^(@)=-1xxF(-1)` `bar(2Mn^(3+)+2H_(2)Orarr Mn^(2+)+MnO_(2))+4H^(+)" "DeltaG^(@)=DeltaG_(2)^(@)=-48250J(DeltaGlt0)` |
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