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A lake with a cross sectional- area of 1km^2 and a depth of 125m has an euphotic zone that extends 15m below the surface what is the maximum weight of the biomass (in grams of carbon) that can be decomposed by aerobic bacteria in the water column of the lake below the euphotic zone during the summer when there is no circulation with the upper layer? The bacterial decomposition reaction is

\((CH2O)n+nO2->nCO2+nH20\)

THe solubility of oxygen in pure water saturated with air at 20 degree C is 8.9 mg/L.

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