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Experimental values range from 0.001 to 0.2 cm/s. What are the possible sources of such wide distributions in experimental values?
The current PCO2 is 358 ppmv. Predict what will be the average pH of rainwater in the year 2050? Is your estimate realistic? Justify your conclusions.
Design a CSTR in series with the first one that can reduce the pollutant concentration to 0.1 mg/dm3. Which combination do you recommend and why?
If after 3 h of operation, the concentration of the bacteria is 3 × 10-5 kg/dm3, what is the specific growth rate of the bacteria?
If the effluent from the reactor is fed to a series reactor, what is the volume of second reactor if desired pollutant concentration in exit stream 0.1 kg/m3?
If the influent to the lake has a P loading of 5µg/L from agricultural pesticide runoff into the river, is the lake prone to eutrophication?
What is the overall flux of vinyl chloride through the bed? Answer in kg/m2 s. What is the mass rate through the bed in kg/h?
What is the desired gas flow rate to obtain a 1-h breakthrough in treating an air stream using a carbon bed of density 0.35 g/cm3.
Consider the city of Baton Rouge, Louisiana, with a population of 400,000. Determine the CO concentration in the atmosphere at 9 a.m.
The wind speed was 2 m/s and leak occurred on an overcast day. What is the likely concentration 10 km from the plant site?
What is the CO concentration after 2 h of cooking inside the hut? Compare the steady-state indoor CO concentration with the U.S. ambient air quality criteria.
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;