So the citric acid cycle doesn't actually directly form ATP molecules. What it actually does is it forms these NADH and fadh two molecules, the high energy electron carriers that will then be used by the electron transport chain to synthesize the ATP molecules. Now, the way that we described our citric acid cycle on the diagram is for a single acetyl coenzyme A. But because glucose produces two acetyl coenzyme A, ultimately that means that this cycle will actually take place twice for any single glucose molecule. So a single glucose molecule breaks down to two pyruvates. And since each pyruvate creates that acetylco enzyme A, we have two of these acetylcoenzymes A.