Question: please help me with these two questions. im having a hard time with it. thank you so much. 4. Problem 2.20, modified. Find the theoretical

please help me with these two questions. im having a hard time with it. thank you so much.

time with it. thank you so much. 4. Problem 2.20, modified. Find

4. Problem 2.20, modified. Find the theoretical oxygen demand of the romowng: a. 200mg/L acetic acid, CH3COOH b. 30mg/L ethanol, C2H5OH c. 50mg/L glucose, C6H12O6 d. 100mg/L cyclopentane, C5H10 8. Problem 2.26 modified. Calculate the equilibrium concentration of dissolved oxygen in 15C and 20C water at 1atm, and at 2000m elevation. Use eqn. 2.32 to calculate atmospheric pressure

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