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(a) Water in vadose zone contains chlorobenzene of concentration 40 mg/L. What is the equilibrium
concentration soil air in contact with this solution?
(b) An aquifer with porosity 0.3 has distribution coefficient of TCE as 100 L/kg. What fraction of TCE is in
aqueous phase and sorbed phase of the soil?
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- Pressure (A) Explain the term pressure and state its S.I. unit. (B) Explain Henry’s law. (C)A bottle of H2 has just been received by the technicians in DkIT for use in the instrumentation lab. It is a 47 litre cylinder at a pressure of 50 atmospheres. The normal working pressures is 2 bar. (i) To what volume of gas will that equate at the working pressure? (ii) For how many hours will the gas last if it used at the rate of 0.5dm3 per hour? D)You see your best friend at the bar and you walk up behind her. You accidentally startle her and she takes a step backwards. Unfortunately, she is wearing high heels and her heels come down on your foot. She weighs only 55kg but the size of her heel is 6mm by 6mm.Determine the pressure that she applies on your foot. (E) If a diver dives to a depth of 35 m what will be: (i) the pressure in Pascals due the water column? (3 marks) (ii) the pressure of the air in…Sulfur dioxide emissions from coal-based power plants areremoved by flue-gas desulfurization.The flue gas passes through a scrubber, and a slurry of wet calcium carbonate reacts with it toform carbon dioxide and calcium sulfite. The calcium sulfite then reacts with oxygen to form calcium sulfate, which is sold as gypsum. (a) If the sulfur dioxide concentration is 1000 times higher than its mole fraction in clean dry air (21010), how much calcium sulfate (kg) can be made from scrubbing 4 GL of flue gas (1 GL1X10^9L)? A state-of-the-art scrubber removes at least 95% of the sulfur dioxide. (b) If the mole fraction of oxy-gen in air is 0.209, what volume (L) of air at 1.00 atm and 25°C is needed to react with all the calcium sulfite?b) A carbonate of metal X has the formular X,CO3. The carbonate reacts with hydrochloric acid according to the following equation: X,CO3 + 2HC! → 0.25g of X,CO3 was found to neutralize exactly 23.6cm³ of hydrochloric acid of concentration 0.15moldm? ( RAM for C=12;0=16) i) Calculate the number of moles of hydrochloric acid 2XCl + CO2 +H,0 ii) Calculate the number of moles of X,CO3 iii) Calculate the relative molecular mass of X,CO3 iv) Calculate the relative atomic mass of X and hence deduce its identity c) Propanoic acid is a weak acid with an acid dissociation constant of 1.22x 10°moldm i) Write an equation for the ionization of propanoic acid -3 ii) Calculate the pKa for propanoic acid Lo iii) Sodium propanoate is made by the titration using 0.1M sodium hydroxide with propanoic acid A: Write an equation for the reaction B: Name a suitable indicator for this titration iv) A mixture of sodium propanoate and propanoic acid acts as a buffer solution. What is a buffer solution?
- (1) (2) ] A certain species of trout requires dissolved oxygen of 7.5 mg/L. Would it be wise to release the trout in a mountain stream at an altitude with a Po2 = 0.17 atm. (KH (02) = 1.3x10-³ mol/Latm). Calculate the mole fraction for the following: 14.5 g of HNO3 in 150 g of H₂O. (b) moles of Solute kg Solvent X (a) H=1.01 N = 14.00- 50 mm= 63.01 g/mol 03=16.0x3 Imol 14.6g HNO3 63.01g 149 150 g 1000g = 0.15 kg 6.00 M HCI. (notice, concentration is an extensive property. You can assume any volume!) 0.23 mol HNO3 0.16 kg H2O 1.53 = 0.23 mol HNO3(a) A commercial 737 jet transporting 143 passengers and 5 crew members from Kansas City (MCI) to Baltimore (BWI) burned 11,800 lb (about 1700 gallons) of Jet A fuel en route. Jet A fuel is kerosine based, consisting primarily of CnH2n+2 hydrocarbons, with n =6 to 16, so the carbon:hydrogen ratio is close to 1:2. During this flight, how much CO2 was released into the atmosphere? Assume the combustion of the fuel was complete, so all the fuel was burned to form CO2 and H2O. Give both the mass of CO2 produced (in kg and in lbs) and the volume it would occupy at 298 K, 1 atm.(b) How much CO2 would be released into the atmosphere if those passengers and crew made the trip instead, in pairs, in hybrid cars at 40 miles per gallon. Assume the density of the gasoline is 0.75 kg L-1 and that carbon and hydrogen dominate the composition in a ratio of 1:2. The road trip is 1082 miles.Soil vapor extraction (SVE) is used to remove volatile or-ganic pollutants, such as chlorinated solvents, from soil at haz-ardous waste sites. Vent wells are drilled, and a vacuum pump is applied to the subsurface. (a) How does this remove pollutants?(b) Why does heating combined with SVE speed the process?
- 1. A piece of metal "X" weighing 0.0382 g was placed in an eudiometer containing dilute aqueous HCI. After the metal fully dissolved,15.4 mL of hydrogen gas was collected by displacement of water and a 400 mm column of water was observed. The water temperature was 25 degrees Celcius and the barometric pressure was 758.8 mm Hg (torr). Refer to the introduction and data sheet to solve the following problems. a) Calculate the volume occupied by the hydrogen gas at STP. b) How many moles of the metal were consumed in the reaction? c) What is the molar mass of the metal?A student performed the experiment described in this module, using 6.00 mL of a 3% H2O2 solution with a density of 1.03 g mL-1. The water temperature was 22 ° C, and the barometric pressure in the laboratory was 30.30 in. Hg. After the student immersed the yeast in the peroxide solution, she collected 65.40 mL of Oz. (7) Calculate the mass of H2O2 in 5.00 mL of the H2O2 solution.You are required to prepare 5 L of a solution containing 1.000 x 103 mol/L of Cu2"(aq). Which of the following procedures would produce an appropriate solution? O Dissolve 0.0636 g of copper metal in nitric acid, add to a 5.000 Lvolumetric flask, dilute to the mark with deionized water and mix well. O Dissolve 1.248 g of CuSO.5H,0(s) in deionized water, add to a 5.000 L volumetric flask, dilute to the mark with deionized water and mix well. Dissolve 0.250 g of CUSO,.5H,O(s) in deionized water, add to a 5.000 L volumetric flask, dilute to the mark with deionized water and mix well.
- A STOCK SOLUTION containing 0.1581 g/L K2CrO4 was prepared.In order to make the CALIBRATION STANDARD, 5 ml of the STOCK was transferredinto a 50ml volumetric flask and then diluted with an appropriate solvent.Calculate:(a) The ppm of K2CrO4 in the CALIBRATION STANDARD.(b) The molarity of K2CrO4 in the CALIBRATION STANDARD. (c) Calculate the molar absorptivity of K2CrO4 (at 371.0 nm). Assume that Beer's Law isobeyed over this concentration range.At 371.0 nm, this CALIBRATION STANDARD in a cell of path length 1.00 cm gave a %T of 59.752.Regarding sewage quality parameters with regard to physical and chemical characteristics, mark V for True or F for False: ( ) Turbidity is caused by the abundance of suspended solids in the water, the fresher and more concentrated the sewage, the greater its turbidity. ( ) Phenols present in sewage are inorganic compounds derived from domestic effluents, and despite being organic matter, they do not cause any change in water quality. ( ) Sewage, both fresh and old, derived from both domestic and industrial activities, is always gray or black in color. ( ) Household effluents have a BOD of around 300 mg/L, which means that 1 liter of sewage consumes about 300 milligrams of oxygen in 7 days. ( ) Phosphorus is a component that can be present in sewage in both organic and inorganic form. In large quantities, the compound causes the exaggerated growth of algae in the medium, which can cause the death of local aquatic life, this phenomenon is called eutrophication.A 100-liter empty jar was spiked with 20 mg of TCE (C2HCl3) under room temperature condition. The jar was then closed tightly. What is the concentration (in atm.) of TCE in the air at 25 C? (TCE: MW: 131.4 g/mol; TCE solubility in water (Cs) = 1100 mg/L; Pv (pure liquid at 25oC) = 10^-1.01 atm. KH = 10^1.03 L atm mol-1; KOW = 102.42). if the jar was half filled with water and half filled with air, what were the concentrations of TCE in both air and water at 25C?