One complete turn of the citric acid (Krebs) cycle oxidises one acetyl group ($\text{C}_2$) and produces 2 molecules of CO₂: one at the isocitrate dehydrogenase step and one at the α-ketoglutarate dehydrogenase step. The overall equation per acetyl-CoA is: $\text{Acetyl-CoA} + 3\text{NAD}^+ + \text{FAD} + \text{ADP} + \text{P}_i + 2\text{H}_2\text{O} \rightarrow 2\text{CO}_2 + 3\text{NADH} + \text{FADH}_2 + \text{ATP} + \text{CoA}$.