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- Chemistry The levels of an organic pollutant (P) in the groundwater at the perimeter of a plant were a cause for concern. A 10 mL sample of the water was taken and the pollutant was extracted with 95% efficiency using 25 mL of diethyl ether. GC was used to analyse the concentration of P in diethyl ether. A calibration curve was plotted for a series of standards of P which yielded the following results: Peak Area Toluene Conc. (µg/ml) 12,000 2.6 23,700 5.0 35,500 7.7 46,800 9.9 31,250 Sample Determine the concentration of P in ppb in the initial groundwater sample.Downvoted for wrong solution. A river is carrying water containing 2000 mg/l Magnesium Chloride into a small lake. The lake has a naturally occurring Magnesium Chloride of 50 mg/l. If the river flow is 2500 Lmin and the lake flow rate is 1.5 m³.sec¹, what is the concentration of MgCl2 in the lake after the discharge point? Assume that the flows in the river and lake are completely mixed, that the salt is a conservative substance, and the system is at steady state.calculate the flow rate in ml/hr . order 40meq/l at 10meq/hr in 1000ml in d5w supply 20meq/10ml
- If 35,000 kg of whole milk containing 4% fat is to be separated in a 6-hour period into skim milk with 0.45% fat and cream with 45% fat, what are the mass flow rates of the two output streams from a continuous centrifuge which accomplishes this separation? (Ans; Cream=464.8335kg/h, Skim milk= 5368.4998kg/h)Calculate the required chlorine concentration for a direct filtration water treatment process at a temperature of 20 oC and pH of 8.0. The t10 time in the clear well is 8 minutes. After the Clearwell, the travel time in the pipeline is 10 minutes. Provide your answer with units of mg/Lif a volumetric pipet delivers 24.844g of deionized water at 31.00 degrees C, what is the calibrated volume of the pipet?
- A pipet is used to transfer 6.00 mLmL of a 3.75 MM stock solution in flask “S” to a 25.00-mL volumetric flask “A,” which is then diluted with DI H2OH2O to the calibration mark. The solution is thoroughly mixed. Next, 10.00 mLmL of the solution in volumetric flask “A” is transferred by pipet to a 50.00-mL volumetric flask “B” and then diluted with DI H2OH2O to the calibration mark. Calculate the molarity of the solution in volumetric flask “B.”An exothermic reaction is taking place in a constant volume reactor that contains a cooling coil. The reaction A -> B proceeds with a reaction rate constant of k1. The rate of reaction is given as kCA. The feed concentration of A is 4 mol/L, the reaction conversion is 50%, and the reaction rate constant k is 1*10-2 h^-1. The volumetric flow rate remains constant throughout the reaction, at 2 L/hr. The initial temperature in the reactor is 40°C, and the final temperature is 60°C. The heat released at the end of the reaction is 60 j/mol. The amount of heat removed by the coil is 400 j. The density of the mixture is 4 kg/m^3, the Cp value is 20 j/mol.K. If the reactor volume is 4 liters, find the change in temperature over time.1. Estimate the density of a 25-API gravity dead oil at 100 F.
- Use E5C.1(a) to Plot the data in excel. Place two data sets on the same graph: one for temp vs. x and one for temp vs y (remember, x and y are the mole fractions and they belong on the x-axis). Don’t forget to include the boiling points of the pure substances – they are data, too. Add a trendline (polynomial, 3rd order should work) to each of the coexistence lines separately. Scale the plot appropriately and use the graph to answer the questions. Then complete E5C.1(b)4.Consider the peaks for pentafluorobenzene and benzene in the gas chromatogram shown here. The elution time for unretained solute is 1.06 min. The open tubular column is 30.0 m in length and 0.530 mm in diameter, with a layer of stationary phase 3.0 μm thick on the inner wall. a) Measruing the width, w, at the baseline on the chromatogram, find the number of plates for these two compounds b) Use your answer to (a) to find the resolution between the two peaks c) Using the number of plates N=sqrtN1*N2 with the values from (a) calcuate what the resolution should be and compare your answer with the measured resolution in bExpress [O3] = 2.0 x 1012 molecules cm-3 as a volume mixing ratio (ppbv) at 25 ºC, 1 atm.