Monday
July 28, 2014

Homework Help: Chemistry

Posted by Matt on Friday, April 18, 2008 at 11:37pm.

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

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