reduction of nitrate by oxidation of H2, and the reduction of oxygen by oxidation of NADPH?
Added by Connie M.
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The reduction of nitrate (NO3-) typically involves its conversion to nitrite (NO2-) and further to nitrogen gas (N2) or ammonia (NH3) through a series of enzymatic reactions. The reduction of oxygen (O2) involves its conversion to water (H2O) or other reduced Show more…
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1. Is the transformation of nitrate to nitrogen gas an oxidation or a reduction? How many electron equivalents are transferred per mole of nitrate? 2. Is the transformation of NH4+ to NO2- an oxidation or a reduction? How many electron equivalents are transferred per mole of nitrite? 3. How many electron equivalents are transferred in the transformation of one mole of NH4+ to NH3?
Madhur L.
Below are the paired reduction reactions for chemolithotrophic denitrification: these organisms are using nitrate as an electron accepter and are using hydrogen gas as a source of energy and electrons. 2NO3- + 10e- -> N2 (+0.74 volts) 2H+ + 2e- -> H2 (-0.42 volts) Using the information given, calculate the ΔE for this reaction, balance the full reaction to determine n, the number of electrons transfered when 99 molecules of H2 are oxidized. Finally, use the simplified Nernst Equation ΔG = -nFΔE, where F = 96.48 kJ (mol e-) to determine the Gibbs Free energy available to do work! Report your answer in kJ rounded to two decimal places. Report only the numeric portion of your answer e.g. 1.01, not 1.01 kj per mole. Answers should ALWAYS be negative since this is a spontaneous reaction.
Sri K.
Some bacteria can use nitrate as an electron acceptor instead of oxygen, reducing it to nitrite. This requires an enzyme called nitrate reductase. a. Write a balanced equation for the oxidation of NADH by nitrate. (5 points) b. Calculate the Gibbs free energy change under standard state conditions (ΔGo’) for the oxidation of NADH by nitrate [tip: you will need to look at Table 3.5 in the textbook]. The Faraday Constant, F, is 96.5 kJ/V.mol. (10 points)
Dominador T.
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