Problem Solved: Oxygen Transfer to Water - Wastewater Math

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This question comes from the California Wastewater grade 4 certification exam sample questions that can be found here: http://www.swrcb.ca.gov/water_issues/...

The problem reads:
Using the data given below determine the number of pounds of dissolved oxygen transferred to water in an aeration tank by 1000 cubic feet of air.  Assume that air is 21% oxygen EITHER BY WEIGHT OR BY VOLUME.

Oxygen to Water Transfer Efficiency: 6.35%
Air weighs 0.075 pounds per ft3

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