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Only one molecule of N2 is needed to produce 2 molecules of NH3 because when the single N2 separates there are 2 single nitrogen atoms. The single nitrogen atom reacts with 3 H2 molecules, borrowing 3 hydrogen atoms to create a single NH3 molecule. The remaining nitrogen atom bonds with the 3 remaining hydrogen atoms to make the second NH3.

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How many molecules of ATP are produced for each glucose molecule undergoing aerobic respiration?

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