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Benzene is a common groundwater contaminant due to the leaking of underground storage tanks. It degrades biologically following first-order kinetics with a decay constant of

Benzene is a common groundwater contaminant due to the leaking of underground storage tanks. It degrades biologically following first-order kinetics with a decay constant of 0.13 hr^-1.

how long will it take for 50% of the benzene to be destroyed
how long will it take for 99% of the benzene to be destroyed.

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