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Chloride dioxide which is prodcued by the reaction: 2NaClO2 + Cl2 --> 2ClO2 + NaCl has...

Chloride dioxide which is prodcued by the reaction: 2NaClO2 + Cl2 --> 2ClO2 + NaCl has been tested as a disinfectant for municipial water treatment. Calculate E^o and DG^o at 25C for the prodcution of ClO2. Answer is E=0.41 and DG -79kj How would you find the half reactions? I am confused.

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