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Calculate the half-life of the reaction when CA0 is 2 mol/L. How long will it take for CA to change from 5 to 1 mol/L?
Determine the rate constant for the disappearance of B2 in units of m3/mol/s and m3/s.
What is the order of the reaction in B? Write down the expression for the rate of disappearance of B and the rate of appearance of A.
what is the concentration of Nitrogen dioxide in ppmv in air that has 21% oxygen at 1 atm. The total concentration of NO2 is 10 ppmv.
Estimate the equilibrium partial pressure of naphthalene over an aqueous solution containing 1 × 10-4 mol/L of naphthalene.
If water in the lagoon is overlying the sediment in equilibrium with it at 30oC. What is the concentration of ethylbenzene in the sediment (answer in mg/kg)?
The air above the lake is found to have traces of a pesticide (lindane) at a concentration of 1µg/m3. Determine the concentration of the pesticide in catfish.
Obtain the octanol-water partition constant of the compound; Obtain the vapor pressure of the compound from an appropriate correlation;
Determine log Kow of HBB using a group contribution method and derivative method. From data in (a) determine the aqueous solubility of BHH expressed in mol/L.
What is the total free energy of the redox process? How is the reaction affected in a slightly acidic lake water (pH = 6)?
Assume a linear adsorption constant Kd for a nonionic organic pollutant. Discuss your results with respect to the two compounds 1,2-DCE and p,p'-DDT.
The acid-catalyzed decomposition of urea has a rate constant of 4.3 × 10-4 h-1 at 334 K and 1.6 × 10-3 h-1. What is the rate at a room temperature of 300 K?
At values of pH > 2 acid catalysis is unimportant. The uncatalyzed reaction rate k0 is 4×10-5 s-1 at 20oC.At pH = 8, what is the rate constant of the reaction?
How long will it take for the chemical to show up in the community drinking water? Assume no biodegradation of DCA.
What is the apparent air-water partition constant at pH 7? The enthalpy of solution is -31 kJ/mol. Calculate the air-water partition constant at 4oC.
What is the fraction of each of the following compounds partitioned from the atmosphere to a sugar maple leaf?
The mean concentration of formaldehyde in air is 0.4 ppb, whereas that in seawater is 40 nM. What is the direction and magnitude of flux?
Estimate the dry (vapor) deposition rate of fluoranthene. A deposition velocity of 0.1 m/s can be assumed.
What is the expected air emission of Aroclor 1242. Properties for Aroclor 1242 and 1254 should be obtained from the literature.
Estimate the mean aqueous concentration of benzene allowed in the impoundment. The area of the impoundment is 104 m2.
Estimate the direction and magnitude of the annual flux of DBP. The reported vapor pressure and aqueous solubility of DBP at 25oC are 1.4 × 10-5 mm Hg and 3.25.
If the aqueous solution in (a) also contains 0.05 mol fraction of ethanol, what is the value of the sediment-water partition constant?
Obtain from the above data the retardation factors for the sorbing compounds. Obtain the field-determined partition constants. The soil organic carbon is 0.02.
Use pyrene and benzene as examples. For a fish that weighs 1.5 lb, how much pyrene can be accumulated within its tissue?
Calculate the PCB loading in a 1 lb catfish dwelling in the lake. Assume equilibrium between the various phases in the system.