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- Forgot to put the units they are asking for on the previous submission. Am I doing this correctly? A gaseous sample of molecules, with a molar mass of 87.9 g/mol, is contained in a cylinder at a temperature of 362. K and pressure of 101.9 kPa. The collision cross section of a molecule is 0.73 nm2 The collision freqency, z, of the gas under these conditions is ____________ s-1.What is the Molecular weight of a certain volatile liquid which is placed in 225 g flask which has total capacity volume of 252.17 mL. After the liquid was heated to 96.7 oC the gass volatilized and the weight of the flask measure 227.33g. What is the could be the MW of the volatile sample?An important process for the production of acrylonitrile (C3H3N) (U.S.production is greater than 109 lb) is given by the following reaction: 2C!H"(?) + 2NH!(?) + 3O#(?) H⎯⎯⎯J 2C!H!N(?) + 6H#O(?)A 150.-L reactor is charged to the following partial pressures at 25°C: ? = 0.500 MPa? = 0.800 MPa ? = 1.500 MPa What mass of acrylonitrile can be produced from this mixture (MPa = 106 Pa)?
- Chemistry An aquifer contaminated with petroleum is found to have the following component concentrations at a particular site: benzene158 ppm toluene124 ppm ethylbenzene91 ppm xylene45 ppm n-heptadecane161 ppm pristane 84 ppm Provide an estimate for the age of the spill at this site using (a) BTEX ratio and (b) nC17:Pr ratio. Show your calculations and use units throughout. Give proper s.f. for the answer.1) Mass of flask, aluminum foil, and rubber band 68.45g 2) Temp. Of boiling, water 98.20 0C 3) Barometric pressure 755 mmHg 4) Volume of flask (volume of vapor occupies flask) 152 ml 5) Mass of flask, aluminum foil, rubber band, and condensed vapor 68.60g 6) Mass of condensed vapor is (5)-(1) Find Molecular weight of unknown ______ g / mol Calculation PV = (m/M)RT) è M = (mRT) / PV = ? Unknown liquid- Based on Molecular weight determine which unknown below has this molecular weight: Methanol, Ethanol, Isopropanol, Propanol. UNKNOW IS : __________________________A 10.0 mL sample of CO2 is collected by the downward displacement of water at 23.0°C and a room pressure of 100.5 kPa. What is the volume of dry CO2 at 0.00°C and 90.0 kPa?
- A student obtained an average PV value of 42,000 in column ( of the data table. If the syringe had een able to be adjusted to a volume of 35.0 mL, what would the pressure be inside the flask? emember that PV = k and the volume you used includes the flask as well as the syringe. Given that the volume of the flask and the syringe is 553. Round to the correct sig figs.Ammonia gas (A) diffuses through a stagnant gas mixture consisting of one-third Nitrogen (B) and two thirds Hydrogen (C) by volume. The total pressure is 206.8 kN/m2 and the temperature is 540c.Calculate the rate of diffusion of Ammonia through a film of gas 0.5mm thick when the concentration change across the film is 10% to 5% by volume. The diffusivities at 200 0 c and one std. atm.pressure are reported to be DAB = 5.391 x 10 -4 m2 /s and DAC = 1.7371 x 10 -4 m2 /s.The global emissions of methane have been estimated to be near 9,390 million metric tons of CO2 equivalent, assuming there is a GWP of 25. Calculate the residence of methane in the atmosphere. If the concentration of methane in the atmosphere is 1.55 ppmv. Can an expert, please show me how to solve the question above?
- A circular lake of diameter 2.5m is receiving wastewater with a flow rate of 25 L/sec from a village has phosphorus concentration of 0.5 mg/L. The lake receives Phosphorus point source concentration of 0.8 g/sec. If the wastewater is completely mixed in the pond and removes phosphorus with a removal rate of 12 m/year, find the concentration of phosphorus (mg/L) in effluent water stream? Assume steady state. (Round-off to one decimal place).Derive an expression that shows how the pressure of a gas inside an effusion oven (a heated chamber with a small hole in one wall) varies with time if the oven is not replenished as the gas escapes. Then show that t1/2, the time required for the pressure to decrease to half its initial value, is independent of the initial pressure. Hint: Start from the expression for the rate of effusion and rewrite it as a differential equation relating dp/dt to p; recall that pV = NkT can be used to relate the pressure to the number density.Benzene is dissolved at a constant initial concentration of 350 mg/l and is contained within a landfill in leachate water above bottom liner of the landfill system. It starts to diffuse through the liner at time t = 0. Using Equation Ci (x,t) = Co erfc x/ 2(D*t)0.5 related narrative, and (error function table), calculate the concentration of benzene at its breakthrough location as it diffuses through a 1.5 meter thick liner (x=1.5 meters represents breakthrough location where liner fails of contaminant is released), after 50 years. Assume D = 10-5 m2/sec (diffusion coefficient in free standing water) and w = 0.7 (coefficient of tortuousity). Clearly present your assumptions and your value of erf, Select the answer range which best fits the answer you calculate. Group of answer choices 315 to 350 mg/l My answer is not in the range of any of the choices my answer. 215 to 314 mg/l 175 to 200 mg/l 370 to 400 mg/l