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Balance the redox reaction of toluene (C7H8) oxidation (to carbon dioxide) coupled to iron reduction (Fe(OH)3(s)...

Balance the redox reaction of toluene (C7H8) oxidation (to carbon dioxide) coupled to iron reduction (Fe(OH)3(s) to Fe2+).

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Answer #1

C7H8 --> CO2

Fe(OH)3 --> Fe+2

split

C7H8 --> CO2

Fe(OH)3 --> Fe+2

balance all atoms other than O and H

C7H8 --> 7CO2

Fe(OH)3 --> Fe+2

balance O addin H2O

14H2O + C7H8 --> 7CO2

Fe(OH)3 --> Fe+2 + 3H2O

balance H

14H2O + C7H8 --> 7CO2 + 28H+

3H+ + Fe(OH)3 --> Fe+2 + 3H2O

balance charges

14H2O + C7H8 --> 7CO2 + 28H+ + 28e-

3e- + 3H+ + Fe(OH)3 --> Fe+2 + 3H2O

balanc e-

3*14H2O + 3C7H8 --> 3*7CO2 + 3*28H+ + *328e-

28*3e- + 28*3H+ + 28Fe(OH)3 --> 28Fe+2 + 28*3H2O

42H2O + 3C7H8 --> 21CO2 + 84H+ + 84e-

84e- + 84H+ + 28Fe(OH)3 --> 28Fe+2 + 84H2O

add

42H2O + 3C7H8 + 84e- + 84H+ + 28Fe(OH)3 --> 28Fe+2 + 84H2O + 21CO2 + 84H+ + 84e-

cancel common terms

3C7H8 + 28Fe(OH)3 --> 28Fe+2 + 42H2O + 21CO2

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