A hydrogenotrophic denitrifier produces 3 moles of ATP per mole of H 2 consumed.

Question

A hydrogenotrophic denitrifier produces 3 moles of ATP per mole of H 2 consumed. If G°’ = - 30.6 kJ/mole for ATP hydrolysis, How efficient is this microorganism in harvesting the chemical energy of H ? For simplicity, assume standard conditions and pH 7, and consider the following potentially useful thermodynamic information.

Redox Pair                            E°' (Volts)

CO/CHO                              -0.93

H+/H                                        -0.41

NAD+/NADH                            -0.32

NO/N                                 +0.74

O/HO                                    +0.82

F = 96.63 kJ/volt.mole

Explanation / Answer

Energy input = 0.41*96.63 = 39.61 KJ/mole

energy output = 30.6*3 = 91.8 KJ/mole

efficiency = (output/input) *100 = 2.3%

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