139) 500 kg of n-propanol are accidentally discharged into a body of water containing 1e8 liter of water. By how much is the BOD(mg/L) of this water increased?
196) Consider a body of water in equilibrium with solid calcium sulfate CaSO4, for which Ksp = 4E-5 at 25 degrees C. Calculate the solubility of calcium sulfate in water (in grams/liter) assuming that other reactions are negligible.
109. Consider a vehicle powered by hydrogen gas. a. About 3.2 kg of H2 is required for a vehicle to have a 500 km range. Assume ideal gas behavior and a storage tank of 60 L (a comparable size to conventional gasoline vehicles). What tank pressure atm might one expect at 25 degrees celsius? b. Since their discovery in 1991, ti ...continues
At an altitude of 45.00 km, the average atmospheric temperature is essentially 0 degrees C. What is the average number of air molecules per cubic centimeter of air at this altitude?
Equil. ratios; pH; pE values, etc. (Not sure where to start on this)
Deduce the equilibrium ratio of NH4+ to NO3- at a pH of 4.0 for aerobic water having a pE value of +9.0 and for anaerobic water for which the pE value is -7.0. (Provide the aerobic answer in the first field and the anaerobic in the second.)
182. The PCB concentration in Lake Michigan is declining according to a first-order rate law having a rate constant of 0.079 per year. If the PCB concentration in Lake Michigan averaged 0.47 ppt in 1991, what will it be in 2005? In what year will the concentration fall to 0.10 ppt? What is the half-life period of PCBs in this la ...continues
Not for OTA 102922 - Equil. ratios; pH; pE values, etc.
Deduce the equilibrium ratio of NH4+ to NO3- at a pH of 4.0 for aerobic water having a pE value of +9.0 and for anaerobic water for which the pE value is -7.0. (Provide the aerobic answer the anaerobic answer.) This is not for OTA 102922 as he has already tried this question once.
Leachate from landfills- example and health effects
I am trying to understand the effects of leachate from landfills and its effects on groundwater, and since I am in environmental health- its effects on the human health. Can anyone help explain these concepts to me? Also, does anyone know of any examples where leachate became a problem? Why is it important to study?
Landfill Leachate- Groundwater- Proof read
I am just trying to summarize what Landfill Leachate does to groundwater, and am hoping you can read this over to see if it makes sense and flows. Also, am I missing anything extremely important? I appreciate your expertise in reading this over.. It is extremely important to me. The parts I am most concerned with are the ...continues
Problem involving dissolving of limestone
In a location in Florida, water seeping into the ground contains 50 times as much carbon dioxide as rainwater. This ground water passes through a limestone deposit and ultimately into an underground spring. The spring has a flow rate of 2500 liters per second. How much limestone (CaCO3) in metric tons will be dissolved in thi ...continues
