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Estimate the distance downwind of the spill that would exceed the worker standard exposure limit of 1 ppmv for DCA.
If the phosphorus settling rate is 10 m/y, estimate the average steady-state concentration of P in the lake. The depth of the lake is 1 m.
For a wind velocity of 5 m/s in the city, what is the steady-state concentration of CO in the city? What is the new steady-state concentration?
If the lake volume is V and has a volumetric flow rate of Q, obtain the steady-state concentration of Fe2+ in the lake.
A first-order reaction is 30% complete in 45 min. What is the rate constant in s-1? How long will it take for the reaction to be 90% complete?
Sulfur in the +4 oxidation state participates in a number of atmospheric reactions. What is the rate expression for the process?
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.