Bacteria are not limited to organic matter as a source of electrons or energy.

Bacteria are not limited to organic matter as a source of electrons or energy. Autotrophic denitrification occurs when NO₃^– is used as an electron acceptor and converted to N₂ gas and H₂ gas is used a source of electrons.

Below are the two half reactions we will be working with.

2NO₃^– + 10e^– -> N₂

2H⁺ + 2e^– -> H₂

Which reaction needs to be reversed?  Enter the letter A or the letter B

Balance the half reaction for the conversion of nitrate to dinitrogen gas. Input the reaction co-efficient for each component of the half reaction in the blank provided. The co-efficient might be 1 in some cases.

2NO₃^– + e^– + H⁺ -> N₂ + H₂O

Balance the half reaction for the conversion of hydrogen gas to hydrogen ions. Questions 12-13 are asking for the reaction co-efficients for each piece of the reaction. The co-efficient might be 1 in some cases.

H₂ + -> 2e^– + H⁺

Combine and balance both equations.

NO₃^– + H⁺ + H₂ -> N₂ + H₂O

How many electrons were transferred?

What is the redox potential of this reactions in volts? E⁰_cell = ?

Using the Nernst Equation, calculate the Gibbs Free Energy to deduce how many kilojoules are available to do work based on the stoichiometry you determined? ΔG = -nFΔE, where F = 96.48 kJ (mol e^–)  (Report your answer to 3 decimal places)