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Q21 (25 pts) - A compound C5H12N2O3 can be completely biodegraded by aerobic bacteria. A sample of polluted water contains 75mg/L of this compound (write your answer in mg/L ). a. First, write the balanced chemical equation depicting the first stage of this process ( 5pts ), and calculate the CBODu for this sample of water. (5 pts) b. Next, write the equation for the subsequent oxidation of ammonia ( 5 pts), and calculate the NBOD4(5pts). c. Finally, what is the total BODu (5 pts)