se this list of half-reactions to answer the following question(s). MnO4−(aq) + 8H+(aq) + 5e−  Mn2+(aq) + 4H2O(l) +1.51 V Cr2O72−(aq) + 6e−  2Cr3+(aq) + 7H2O(l) +1.33 V Cu2+(aq) + 2e−  Cu(s) +0.34 V Pb2+(aq) + 2e−  Pb(s) −0.13 V Fe2+(aq) + 2e−  Fe(s) −0.44 V Al3+(aq) + 3e−  Al(s) −1.66 V     Refer to Exhibit 17-1. How many different cells with E°cell in excess of +1.90 V can be constructed using the half-reactions given in the table?     a. 3   b. 4   c. 2   d. 1   e. 5

Introductory Chemistry: An Active Learning Approach
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Chapter19: Oxidation-reduction(electron Transfer) Reactions
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Problem 3E: Classify each of the following half-reaction equations as oxidation or reduction half-reactions: a...
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Use this list of half-reactions to answer the following question(s).

MnO4(aq) + 8H+(aq) + 5e  Mn2+(aq) + 4H2O(l) +1.51 V
Cr2O72−(aq) + 6e  2Cr3+(aq) + 7H2O(l) +1.33 V
Cu2+(aq) + 2e  Cu(s) +0.34 V
Pb2+(aq) + 2e  Pb(s) −0.13 V
Fe2+(aq) + 2e  Fe(s) −0.44 V
Al3+(aq) + 3e  Al(s) −1.66 V

 

 

Refer to Exhibit 17-1. How many different cells with E°cell in excess of +1.90 V can be constructed using the half-reactions given in the table?

 

  a.

3

  b.

4

  c.

2

  d.

1

  e.

5

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