Chemistry

Chemistry

Problem

The two symbolic equations below occur in acidic solution. (1) MnO₄⁻ + 8 H⁺ + 5 e⁻ → Mn²⁺ + 4 H₂O (2) Fe²⁺ → Fe³⁺ + e⁻ Which of the following represents the correctly balanced overall equation that results when the two equations are combined? a) 5 MnO4−+Fe2++40 H+→5 Mn2++Fe3++20 H2O\mathrm{5\,MnO_4^- + Fe^{2+} + 40\,H^+ \rightarrow 5\,Mn^{2+} + Fe^{3+} + 20\,H_2O} b) MnO4−+5 Fe2++8 H+→Mn2++5 Fe3++4 H2O\mathrm{MnO_4^- + 5\,Fe^{2+} + 8\,H^+ \rightarrow Mn^{2+} + 5\,Fe^{3+} + 4\,H_2O} c) MnO4−+5 Fe3++8 H+→Mn2++5 Fe2++4 H2O\mathrm{MnO_4^- + 5\,Fe^{3+} + 8\,H^+ \rightarrow Mn^{2+} + 5\,Fe^{2+} + 4\,H_2O} d) MnO4−+Fe2++8 H+→Mn2++Fe3++4 H2O+5 e−\mathrm{MnO_4^- + Fe^{2+} + 8\,H^+ \rightarrow Mn^{2+} + Fe^{3+} + 4\,H_2O + 5\,e^-}

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