A lake with volume of 200 m³was contaminated with oil. Activated carbon was used as adsorbent for the remediation. The adsorbent over contaminant concentration can be illustrated as follows the chart below. Calculate the amount of adsorbent in (Kg) required to reduce the concentration of oil contaminant from 2 mg/L to 0.2 mg/L. y = 2.2x + 0.015 Log q Log C
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- Organic carbon in seawater can be measured by oxidation to CO2 with K2S2O8, followed by gravimetric determina- tion of CO2 trapped by a column of Ascarite. Water weighing 6.234 g produced 2.378 mg of CO2 (FM 44.010). Find ppm carbon in the seawater.UCI Chemistry researchers, Prof. F. Sherwood Rowland and Dr. Mario Molina werefirst to discovered in 1973 that chlorofluorocarbons (CFCs) were depleting the Earth’sozone layer when released into the atmosphere. Once they reach the stratosphere, Clis released from the CFCs molecules by interaction with UV light. Free Cl atoms areable to react with ozone in a catalytic cycle that converts O3into the more stable O2.It is estimated that a single Cl atom is able to react with∼100000 O3molecules.Although CFCs production was banned in 1996, there are still a substantial numberof motor vehicle air conditioners (MVACs) that use CFC-12 (CF2Cl2) as refrigerant.The average CFC-12 emission rate from operating MVACs has been estimated tobe 59.5 mg per hour per vehicle (Zhang et al.Environ. Sci. Technol. Lett.2017).How much chlorine, in kg, is added to the atmosphere in a year due to 100 millionMVACs using CFC-12 as refrigerant?The use of pesticides have allowed agricultural production to increase without an increase in farmed land. Leaching of pesticides from fields into lakes, streams, and the local water table can have detrimental environmental and health consequences. To limit leaching environmental protection regulations require that the half-life of pesticides to be less the 250 days. Report all answers to 3 significant digits A. You are hired to monitor the compliance of pesticides with environmental regulations. You obtain a a pesticide sample with a concentration of 0.2M/L from a local farmer 25 days later you measure the concentration to be 0.19M/L, is the pesticide in compliance with the regulation? Use the formula below: Use the 25 days as the t value and solve for r then subsitute all known values in to find t1/2. Once you find r, find the half-life and compare your t value to 250 days. N(t) = N(0) . ert B) A catalyst can be added to double the decay rate of the pesticide. What is the…
- One way to determine the hardness of a water sample is to precipitate the calcium out of solution as a carbonate. The net ionic reaction for this precipitation is: Ca2+(aq) + CO32-(aq) → CaCO3 (s) A 1.00 L sample of water is drawn from a Phoenix, AZ well and 0.534 g of calcium carbonate is recovered using the above reaction. What was the Ca2+ concentration of the original water sample in ppm? Show your work and include units. Hint: ppm stands for parts per million, and in the case of an aqueous solution, this is equivalent to mg/L.Qmax is maximum adsorption of acetic acid on activated carbon.If there is another organic compound that has high affinity to activated carbon in the same acetic acid solutions. How Qmax of acetic acid adsorption will change?Lower, Higher or same? EXPLAINI Need —> 1. Try fitting these data using Langmuir Isotherm and obtain K and monolayer of ORA molecules per one gram 2. Try fitting these data using Freundlich Isotherm and obtain its constants 3. Which isotherm describe best the adsorption of ORA on activated carbon and why? 4. If a monolayer of Na molecules is 0.03075 mole per one gram of activated carbon, and the surface area on one N2 molecules is 0.162 nm?. determine: a. surface area per one gram of activated carbon b. surface area of one ORA molecule
- Adsorption of 0.5 M 100 ml of acetic acid solution on 1 g of activated carbon is taking place. After the adsorption process, the non-adsorbed acetic acid is filtered. Take the filtrate into a 10 ml flask and titrate with 0.1 M NaOH to find the equilibrium concentration. is done. The amount of NaOH consumed in the titration per 10 ml of acetic acid solution 42 ml. Find the adsorption capacity of the adsorbent.The adsorption of a gas is described by the Langmuirisotherm with a= 1.85 kPa-1 at 25 oC. Calculate the pres-sure at which the fractional surface coverage is (a) 0.10 and (b) 0.90.Benzene on graphite follows the Langmuir isotherm. At a pressure of 1 atm, theThe volume of benzene adsorbed on a sample of graphite was 4.2 mm3 atconditions T = 0°C and 1 atm. At 3 atm it was 8.5 mm3. Suppose 1 molecule ofbenzene occupies 30Å and estimate the surface area of graphite.
- Prof. Neiman and Prof. James were first to discovered in 1973 that chlorofluorocarbons (CFCs) were depleting the Earth’sozone layer when released into the atmosphere. Once they reach the stratosphere, Clis released from the CFCs molecules by interaction with UV light. Free Cl atoms areable to react with ozone in a catalytic cycle that converts O3into the more stable O2.It is estimated that a single Cl atom is able to react with∼100000 O3molecules.Although CFCs production was banned in 1996, there are still a substantial numberof motor vehicle air conditioners (MVACs) that use CFC-12 (CF2Cl2) as refrigerant.The average CFC-12 emission rate from operating MVACs has been estimated tobe 59.5 mg per hour per vehicle (Zhang et al.Environ. Sci. Technol. Lett.2017).How much chlorine, in kg, is added to the atmosphere in a year due to 100 millionMVACs using CFC-12 as refrigerant?so that means route a is preferrable in a small lab and route b is preferred in a chemical plant?What is the role of carbon dioxide in air in Fresco Painting? What type of catalytic mechanism (heterogenous or homogenous) exist in Fresco painting? Why?