The question will be based on the reaction below. Cr2+ (aq) + Pb2 (aq)    --> Cr3+ (aq) + Pb (s)   Standard Reduction Potentials Half-reaction Eo (V) Cr2O72- + 14H+ + 6e- --> 2 Cr3+ + 7 H2O   1.36 Cr3+ + e- --> Cr2+ -0.42 Cr3+ + 3e- --> Cr (s) -0.74 Cr2+ + 2e- --> Cr(s) -0.89 Pb4+ + 2e- --> Pb2+ 1.69 PbO2 (s) + 4 H+ + 2 e- --> Pb2+ + 2 H2O 1.458 Pb2+ + 2 e- --> Pb (s) -0.126   a) How many electrons are exchanged in a balanced redox reaction? b) What is Eocell for this reaction? c) What is ΔGo for this reaction (in kJ/mol)?

Fundamentals Of Analytical Chemistry
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Chapter21: Potentiometry
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Problem 21.3QAP
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The question will be based on the reaction below.

Cr2+ (aq) + Pb(aq)    --> Cr3+ (aq) + Pb (s)

 

Standard Reduction Potentials

Half-reaction Eo (V)
Cr2O72- + 14H+ + 6e- --> 2 Cr3+ + 7 H2  1.36
Cr3+ + e- --> Cr2+ -0.42
Cr3+ + 3e- --> Cr (s) -0.74
Cr2+ + 2e- --> Cr(s) -0.89
Pb4+ + 2e- --> Pb2+ 1.69
PbO2 (s) + 4 H+ + 2 e- --> Pb2+ + 2 H2O 1.458
Pb2+ + 2 e- --> Pb (s) -0.126

 

a) How many electrons are exchanged in a balanced redox reaction?

b) What is Eocell for this reaction?

c) What is ΔGo for this reaction (in kJ/mol)?

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