During a regular cleaning cycle for a cylindrical water storage tank (diameter = 60 feet; depth = 25 feet), a technician accidently overdoses the tank with chlorine. The resulting chlorine concentration in the tank is 25 mg/L and the EPA limit for chlorine in drinking water is 4.0 mg/L. The operator decides to flush the tank with water from the distribution system which has a chlorine concentration of 1.5 mg/L and waste the water until the chlorine level reaches the EPA limit. You may assume that for the timeframes considered that chlorine is conservative (i. e., non-reactive) and the tank is completely mixed. a.If the tank is flushed at a rate of 4,000 gpm, how long (in hours) will it take to achieve the 4.0 mg/L concentration?b. The operator is impatient and wants to get this done in 30 minutes. What flushing flowrate (in gpm) would be required to achieve the 4.0 mg/L concentration?c. Calculate the volume (in gallons) of water used (i. e., wasted) for Part A and Part B. Is there another solution to this problem that you can suggest?

How many atoms of oxygen are contained in 160 grams of n2o3

The last few miles of the marathon are the most difficult for heather, her hair plastered to her head, sweat clinging to her arms, and her legs already feeling as if they had nothing left, just dead weight. after grabbing a cup of ice water, she feels the ice cubes smash against her nose as she gulps some cool refreshment and keeps on running. in these last few miles, the breeze kicks up and she finally feels some coolness against her skin. drips of sweat, once clinging to her forehead, now spill down, and heather feels more pain as the sweat flows into her eyes.which of the following is the most likely reason why the ice struck heather’s nose when she took a drink? a) water can function as a solvent. b) water can store large amounts of heat. c) water can moderate temperatures through evaporative cooling. d) the density of water decreases when it freezes. e) water has a cohesive nature.sweat remained on heather’s forehead and arms because of the a) high salt content of sweat b) cohesive nature of water c) ability of water to moderate heat d) high evaporative cooling effect of water e) ability of water to act as a solvent

Is the flow of energy during vaporizing more like the flow during melting or during freezing