How many atp is required to form 4 molecules of ammonia in nitrogen fixation

Dear student,
Option 4 is correct.
Biological nitrogen fixation can be represented by the following equation, in which two moles of ammonia are produced from
one mole of nitrogen gas, at the expense of 16 moles of ATP and a supply of electrons and protons.
N2 + 8H+ + 8e- + 16 ATP ---------> 2NH3 + H2 + 16 ADP +16 Pi

So , 4 molecules of ammonia 32 ATP are required.

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