Question 1 (Soalan 1] (a) It was found that a wastewater sample contains 400 mg/L of chemical compound which can be represented by an empirical molecular formula of C4H,CHNH2COOH. [Didapati satu sampel air sisa mengandungi 400 mg/L bahan kimia yang boleh diwakili oleh formula molekul empirik CH.CHNH2COOH.) Estimate the theoretical chemical oxygen demand (COD) of the sample. [Anggarkan keperluan oksigen kimia (COD) teori bagi sampel tersebut.) (5 Marks/ Markah) ii. If the sample in the above could be degraded biologically, estimate its 5-day biochemical oxygen demand (BOD) value. Given that the rate constant for biodegradation of organic matter, k = 0.3 day! [Jika sampel di atas boleh diuraikan secara biologi, anggarkan nilai keperluan oksigen biokimia (BOD) hari kelimanya. Diberi pemalar kadar penguraian bahan organik, k' = 0.3 hari''.) (2 Marks/ Markah) iii. Discuss why the results of BOD dan COD calculations in the above are different for the same compound. [Bincangkan mengapa keputusan pengiraan COD dan BOD di atas adalah berbeza bagi bahan yang sama. (2 Marks/ Markah) Question 1 (Soalan 1] (a) It was found that a wastewater sample contains 400 mg/L of chemical compound which can be represented by an empirical molecular formula of C4H,CHNH2COOH. [Didapati satu sampel air sisa mengandungi 400 mg/L bahan kimia yang boleh diwakili oleh formula molekul empirik CH.CHNH2COOH.) Estimate the theoretical chemical oxygen demand (COD) of the sample. [Anggarkan keperluan oksigen kimia (COD) teori bagi sampel tersebut.) (5 Marks/ Markah) ii. If the sample in the above could be degraded biologically, estimate its 5-day biochemical oxygen demand (BOD) value. Given that the rate constant for biodegradation of organic matter, k = 0.3 day! [Jika sampel di atas boleh diuraikan secara biologi, anggarkan nilai keperluan oksigen biokimia (BOD) hari kelimanya. Diberi pemalar kadar penguraian bahan organik, k' = 0.3 hari''.) (2 Marks/ Markah) iii. Discuss why the results of BOD dan COD calculations in the above are different for the same compound. [Bincangkan mengapa keputusan pengiraan COD dan BOD di atas adalah berbeza bagi bahan yang sama. (2 Marks/ Markah)