Using sucrose as an organic carbon source calculate the kJ of energy or reaction, and compare for aerobic degradation, anoxic degradation (with NO3 - ), and anaerobic degradation. Explain the significance of these findings in terms of the preferred type of reaction in various DO conditions (note that the free energy value for nitrogen gas (N₂(g)) is 0.0 kJ/mol; assume gaseous state for other dissolved gases like CO₂, O₂, etc.).