Homework Help: Chemistry

Posted by David on Monday, April 21, 2008 at 2:19am.

For the following electrochemical cell:
Fe(s) | Fe2+(aq) || MnO4–(aq), Mn2+(aq) | Pt(s)
Which letter corresponds to the correct balanced chemical equation in an acidic solution?

A. 2Mn2+(aq) + 8H2O(l) + 5Fe2+(aq)-> 5Fe(s) + 16H+(aq) + 2MnO4–(aq)
B. Fe(s)+8H+(aq)+MnO4–(aq)+Pt2+(aq)-> Mn2+(aq)+4H2O(l)+Fe2+(aq)+Pt(s)
C. 5Fe(s) + 16H+(aq) + 2MnO4–(aq)-> 2Mn2+(aq) + 8H2O(l) + 5Fe2+(aq)
D. Fe(s) + 8H+(aq) + MnO4–(aq)-> Mn2+(aq) + 4H2O(l) + Fe2+(aq)
E. Mn2+(aq)+4H2O(l)+Fe2+(aq)+Pt(s)-> Fe(s)+8H+(aq)+MnO4–(aq)+Pt2+(aq)

What reaction is occurring at the cathode?

A. Mn2+(aq) + 4H2O(l)-> 5e– + 8H+(aq) + MnO4–(aq)
B. Fe2+(aq) + 2e– -> Fe(s)
C. Fe(s)-> Fe2+(aq) + 2e–
D. 5e– + 8H+(aq)+MnO4–(aq)-> Mn2+(aq) +4H2O(l)
E. Pt(s)-> Pt2+ + 2e–

Chemistry - DrBob222, Monday, April 21, 2008 at 1:15pm
I thought we did this before. Tell me what you think and why.

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