| List I | List II | ||
|---|---|---|---|
| A | Citric acid cycle | I | Cytoplasm |
| B | Glycolysis | II | Mitochondrial matrix |
| C | Electron transport System | III | Intermembrane space of mitochondria |
| D | Proton gradient | IV | Inner mitochondrial membrane |
What is the empirical formula of a compound containing 40% sulfur and 60% oxygen by mass?