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According to chicks law the rate of kill of bacteria by chlorination follows first order reaction kinetics (radioactive decay is first order kinetics ). assuming

According to chicks law the rate of kill of bacteria by chlorination follows first order reaction kinetics (radioactive decay is first order kinetics ). assuming this to be true, how much contact time is required to kill 99% of the bacteria in a sample with a chlorine residual of 0.1 mg/l if 80% are killed in 2 minutes with this residual?

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