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Hexabromocyclododecane (HBCD) has been a flame retardant used extensively in polyurethane foam (building insulation). Due to its extensive application it is not too surprising that traces of HBCD/are...

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Hexabromocyclododecane (HBCD) has been a flame retardant used extensively in polyurethane foam (building insulation). Due to its extensive application it is not too surprising that traces of HBCD/are found in many sediments in the US. The compound does not degrade readily in the environment and it is bioaccumulative. HBCD could possibly react with reduced sulfur species such as bisulfide. Bisulfide is formed in porewater of sediments.
Br y-HBCD
Br
Br Br a-HBCD
r
(,,.\ a) Determine the (pseudo) first-order reaction rate constant for the reaction of y-NBCD in a solution containing 7.06 mM bisulfide (HS-) at pH = 9.7 and 40 °C using the following data set:
time (hours) concentration (PM XXXXXXXXXX XXXXXXXXXX XXXXXXXXXX XXXXXXXXXX XXXXXXXXXX
A
\,b)rFrom the above-determined pseudo-first order reaction constant, calculate the second-order reaction rate of 7-HBCD with bisulfide at 40 °C.
c) Use your calculated second-order reaction rate constant to determine the time it takes for y-HBCD in a solution of 4.0 mM bisulfide to reach 10% of its initial concentration.(A concentration of 4 mM bisulfide is a typical concentration reported in sediment pore water and slat marshes). d) Assume an activation energy of 85 kJ/mol for this reaction. How long does the same reaction take at 10 °C?
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Answered Same Day Dec 26, 2021

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Robert answered on Dec 26 2021
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