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