Answer: 3
Step-by-step explanation:
These are the 3 hydrogen ions that must carry the needed energy which ATPase must trap from,to synthesize 1 ATP molecule from the :
Reaction of ADP with inorganic Phophate .ADP +Pi - 1ATP
These hydrogen ions were delivered by NAD as NADH and as FADH ,and striped and broken down to
Protons/hydrogen ions and electrons.
Oxygen is the final aceptor of electrons.