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On 13.15 part B the question asks for the half reactons and a galvanic cell for H+(aq)+OH-(aq)-->H2O(l). There are two half recation pairs that give me the desired thermochemical reaction. (2H20+2e--->H2/2H2O+2e--->H2+2OH-) and (O2+4H+4e- --->2H2O/O2+2H2O+4e- --->4OH-). How do i tell which one to use?
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