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Question: in chemolithoautrophic denitrification the reduction reactions below are paired microbes...

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  1. In chemolithoautrophic denitrification the reduction reactions below are paired. Microbes are using nitrate as an electron accepter and are using hydrogen gas as a source of energy and electrons.

    1. 2NO3- + 10e- -> N2
    2. 2H+ + 2e- -> H2

    The reduction tower always lists reduction reactions. In order to form a redox couple, one of the two reactions needs to be reversed—this means it needs to be expressed as an oxidation potential rather than a reduction potential.

    Which of the two reactions needs to be reversed to correctly reflect chemolithoautrophic denitrification?

    2H+ + 2e- -> H2

    2NO3- + 10e- -> N2

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