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Lake silbersee is located in the German city of Nuernberg. The lak's water quality has been diminishedbecause of high hydrogen sulfide concentrations that originate froma nearby leaking landfill. To combat the problem the citydecided to aerate the lake in an attempt to oxidize the odorousH2S to non-odourous sulfate ion according to thefollowing oxidation reaction:H2S+2O2-->SO42-+2HIt has been determined experimentally that the reactionfollows frst order kinetics with respect to both oxygen andhydrogen sulfide concentrations: d[H2S]/dt =-k[H2S][O2]The present rate of aeration maintains that the oxygenconcentration in the lake at 2 mg/L. The rate constant k forthe reaction was determined to be 1000L/mole-day. If the aeration completly inhibits the production of hydrogen sulfide, how long would it take to reduce H2S concentration fomm500μM to 1μM?
QZY, Inc. is evaluating new widget machinesoffered by three companies. The machines have the following characteristics: A B C First cost $15,000 $25,000 $20,000 Maintenance and operating 1,600 400 900
For carbon tetrachloride, the boiling point constant is 5.03°C · kg/mol, and the boiling point of pure carbon tetrachloride is 76.50°C.
During a 108 minute long storm, the precipitation rate over a 100 acre area is 1.65 in/hr. The phi index is 0.42 in/hr. The average outflow from the area is 92 cfs during the storm. What is the value of combined detention and interception storages ..
The spring loaded supporting rods AB and AC in the figure below aer used as shock absorbers for transporting fragile loads. Knowing that the elastic spring constants for the rods AB and AC are kab = 1.2 kN/m and kac = 1.5 k N/m
To determine the elevation of a point B from the elevation of a point A, which is 511.6 ft. When the transit was set up over the point A, the height of the transverse axis above that point was 4.92 ft.
Some distance downstream, the velocity profile can be (very) roughly approximated by a region inside the wake with u = U/2 and an exterior region with u = 3U/2.
A light rail route has 2 terminals and 4 intermediate stations. The demand (passengers/hr) for morning peak hour is: North Terminal Station 1 Station 2 Station 3 Station 4 South Terminal
Many years ago, well-known architect Frank Lloyd Wright designed a mile-high skyscraper, which has never been built.
A contractor has both a 3-cy and a 5-cy shovel in the equipment fleet. Select the minimum-size shovel that will excavate 400,000 bcy of common earth in a minimum of 130 working days of 8 hr each.
one gallon of paint(volume=3.78 x 10^ -3) covers an area of 25 m^2. what is the thickness in mm. of the paint on the wall
The concentration of cadmium ion (Cd^+2) in water is 225 mg/L. Will a precipiate be consumed or produced at pH 9.0? Will a precipitate be consumed or produced at pH 7.5
A rigid-walled cubical container is completely filled with water at 40F and sealed. The water is then heated to 100F. Determine the pressure that develops in the container when the water reaches this higher temperature.
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