The dilution factor d for an unseeded mixture of wastewater is 0.05. the do of the mixture is initially 8.0 mg/l, and after 5 days it has dropped to 2.0 mg/l. the reaction rate constant k has been found to be 0.20 day? (i) what is the 5-day bod of the waste? (ii) what would be the ultimate carbonaceous bod?

Me i dont know what to do! the table compares the number of electrons in two unknown neutral atoms. comparison of electrons atom number of electrons a 10 d 11 use this information to determine the number of valence electrons in the atoms. which of the following correctly compares the stability of the two atoms? both are unreactive. both are highly reactive. a is unreactive and d is reactive. a is reactive and d is unreactive.