Using the Reduction Half-Reactions,write an Overall Reaction in the Direction

question 4

Multiple Choice

Using the reduction half-reactions,write an overall reaction in the direction that it is spontaneous.Calculate E°. $\begin{array}{l}\mathrm{MnO}_{4}-(a q) +8 \mathrm{H}^{+}(a q) +5 e^{-} \rightarrow 2 \mathrm{Mn}^{2+}(a q) +4 \mathrm{H}_{2} \mathrm{O}(l) & E_{\text {red }}^{\circ}=+1.512 \mathrm{~V}\\\mathrm{Fe}^{3+}(a q) +e^{-} \rightarrow \mathrm{Fe}^{2+}(a q) &E_{\mathrm{red}}^{\circ}=+0.769 \mathrm{~V}\end{array}$

• A) 5Fe³⁺(aq)+ Mn²⁺(aq)+ 4H₂O(l)? 5Fe²⁺(aq)+ MnO₄?(aq)+ 8H⁺(aq)E° = +2.333 V
• B) 5Fe²⁺(aq)+ Mn²⁺(aq)+ 4H₂O(l)? 5Fe³⁺(aq)+ MnO₄?(aq)+ 8H⁺(aq)E° = ?0.743 V
• C) MnO₄?(aq)+ 5Fe²⁺(aq)? Mn²⁺(aq)+ 5Fe³⁺(aq)E° = ?2.281 V
• D) MnO₄?(aq)+ 8H⁺(aq)+ 5Fe²⁺(aq)? Mn²⁺(aq)+ 5Fe³⁺(aq)+ 4H₂O(l)E° = +0.743 V
• E) MnO₄?(aq)+ 8H⁺(aq)+ 5Fe³⁺(aq)? Mn²⁺(aq)+ 5Fe²⁺(aq)+ 4H₂O(l)E° = +2.281 V

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