Help chemistry 103?

Posted on 2016-06-17 18:27:00 in Chemistry by LESSY

Pt | Cr3+(0.40 M), Cr2O72-(0.30 M), H+(0.010M) || MnO4-(0.10 M), Mn2+(0.20 M), H+(0.010M) | Pt 

The standard reduction potentials are as follows: 
MnO4- + 8H+ + 5e- → Mn2+ + 4H2O; Eo = +1.51 V 
Cr2O72- + 5e- → 2Cr3+ + 7H2O; Eo = +1.33 V 
When current is allowed to flow, which species is reduced? 
Select one: 
a. Cr2O72- 
b. Cr3+ 
c. MnO4- 
d. Mn2+ 
e. H+ 
please explain

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