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M&M I-Practice Math #4

22.    You need to control an algae bloom in your 20,000,000 gallon raw water reservoir.  The herbicide directions recommend applying 25 pounds/acre.  If the average depth of the reservoir is 15 feet and each bag contains 40 pounds of herbicide, you need ____ bags.

 

23.    To dose a flow of 0.6 mgd at 1.8 mg/L, you need ____ 40 pound bags of the chemical.

 

24.    You try to maintain a 120 day supply of all chemicals.  If a bag contains 40 pounds of chemical, how many bags of a chemical are needed to dose a flow of 0.6 mgd at 1.8 mg/L?

 

25.    The hopper for your chemical feeder is conical in shape with a reserve tank on top.  The hopper has a diameter of 12 feet and a depth of 8 feet.  The reserve tank is 20 feet high.  The total volume of the hopper and the reserve tank is _______ ft³.

 

26.    The hopper for your chemical feeder is conical in shape.  If it has a diameter of 12 feet and a depth of 8 feet, the volume of the hopper is _______ ft³.

 

27.    Calculate the molecular weight of H₂CO₃.  The atomic weight of calcium is 40, oxygen is 16, carbon is 12, and hydrogen is 1.

 

28.    Calculate the molecular weight of H₂O.  The atomic weight of calcium is 40, oxygen is 16, carbon is 12, and hydrogen is 1.

 

29.    Calculate the molecular weight of Ca(HCO₃)₂.  The atomic weight of calcium is 40, oxygen is 16, carbon is 12, and hydrogen is 1.

 

Solutions to I-Practice Math #4

 

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