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- b) A plot of land was explored and found to contain 1,000,000 grams of gold. The average goldconcentration was found to be 0.8 grams per ton. A mine was set up on it and sluice boxes were used as the main gold recovery units and recovered200,000 g of gold from 80% of the ore. The concentration ratio of the sluice boxes was 10,000.The field was mined again. On this occasion bowl concentrators were used. The feed used wasestimated to be 800,000 tons and the concentration ratio of this unit was 20,000. 750,000 grams ofgold was recovered. Calculate the following: i) the Quantity and grade concentrate from the sluice boxes .................. ..................... ii) the quantity and grade of the concentrate from the bowl concentrator plant. .............. iii) the quantity and grade of the material remaining at this location...................................An environmental chemist working for the Environmental Protection Agency (EPA) was directed to collect razor clams from a heavily-contaminated river superfund site and analyze them for their Cd?+ content using graphite furnace atomic absorption spectrometry (GFAAS). The chemist dried the clams at 95 °C overnight and ground them in a scientific blender, resulting in approximately 50 g of homogenized dry weight. A representative 98.75 mg sample was taken from the approximately 50 g of dry material and dissolved in 100.0 mL of 0.1 M HCI to create a sample solution. Using the method of standard additions, the chemist prepared five standard solutions in 100.0 mL volumetric flasks, each containing 5.00 mL aliquots of the sample solution. Varying amounts of a 75.0 ppb (ug/L) Cd? + standard were added to each of the flasks, which were then brought to volume with 0.1 M HCI. The Cd? + content of the solutions was then analyzed using GFAAS, resulting in the. absorbance data given in the table.…A core sample is saturated with an oil (?o = 35oAPI), gas and water. The initial weight of the sample is 224.14 g. After the gas is displaced by water (?w = 1 g/cm3 ), the weight is increased to 225.90 g. The sample is the placed in a Soxhlet distillation apparatus, and 4.4 cm3 water is extracted. After drying the core sample, the weight is now 209.75 g. The sample bulk volume, 95 cm3 is measured in a mercury pycnometer. Find the porosity, water saturation, oil saturation, gas saturation and lithology of the core sample.
- A sample of a soil was analysed for K+ as follows. A 2.50 g sample of soil was dissolved in acid and diluted to volume in 100 mL volumetric flask. A 10 mL of the resulting solution was transferred by pipet to a 50 mL volumetric flask and diluted to volume. An analysis showed that the concentration of K+ in the final solution was 9.81 ppm. What was the weight percent of K+ in the original soil?Two salts A and B are dissolved in water. At the temperature of the experiment, the solubility of A is 1 kg A/kg pure water and that of B is 0.4 kg /kg water. It will be assumed that the solubilities of the two salts are not affected by the presence of each other. If originally 20 kg of A and 20 kg B are dissolved in 100 kg water, and some of the water is evaporated from solution, calculate the: (1) amount evaporated (2) weight of mother liquor (3) composition of mother liquor (4) weight of each crystal formed for the following cases: a) 50% of the water is evaporated b) Enough water is evaporated to reduce the total weight of the solution to 50% of the original value c) Enough water is evaporated to leave the solution saturated with A, without crystallizing any A d) Enough water is evaporated so that the remaining solution is 50% of the original value.Wet air containing 4.0 mole% water vapor is passed through a column of calcium chloride pellets. The pellets adsorb 97.0% of the water and none of the other constituents of the air. The column packing was initially dry and had a mass of 3.40 kg. Following 5.0 hours of operation, the pellets are reweighed and found to have a mass of 3.54 kg. Calculate the molar flow rate (mol/h) of the feed gas and the mole fraction of water vapor in the product gas. The mole fraction of water in the product gas is monitorced and found to have the valuc calculated in part (a) for the first 10 hours of operation, but then it begins to increase. What is the most likely cause of the increase? If the process continues to run, what will the mole fraction of water in the product gas eventually be?
- 20 Carbamazepine tablets were found to weigh 10.000 g in total. The tablets were ground to a fine powder using a pestle and mortar. A 313.2 mg sample of the powder was boiled with 25ml ethanol for a few minutes. The hot mixture was stirred in a closed flask for 10 minutes and filtered through sintered glass. The flask and filter were washed with ethanol and the washings combined with the filtrate. The cooled mixture was made up to 100ml with ethanol (soln A). 5ml of the ethanol extract was diluted to 250ml with ethanol (soln B) and the absorbance of the resulting solution was found to be 0.598 absorbance units at a wavelength of 285nm. The A1%,1cm was 490? a) Calculate the total amount (in mg) of carbamazepine in solution B (1 decimal) Answer = mg b) Calculate the total amount (in mg) of carbamazepine in solution A (1 decimal) Answer = mg c) Calculate the amount (in mg) of carbamazepine in a single tablet. (1 decimal) Answer =b) A gaseous mixture contain 32.9 mol % He, 40.7 mol % N2 and 26.4 mol % Ar. Determine the composition of this mixture on a mass basis based on the molecular weight given: MW (He) = 4.003 , MW (N2) = 28.02, MW(Ar) = 39.95 %3DGive the molar concentration of hydrochloric acid with a specific gravity of 1.18 and has 37% (w/w) purity. MW=36.5
- A tank contains 400 liters of brine holding 100kg of salt in solution. Water containing 125g of salt per liter flows into the tank at the rate of 12 liters per minute, and the mixture, kept uniform by stirring, flows out at the same rate. Find the amount of salt at the end of 90 minutes.Estimate the filtration flow (cm³/sec) of pure water across a membrane with a total surface area of 900 cm². The viscosity of water is 1 cP. The pores in the membrane are rectangular slits with a slit opening of 0.55 micrometers. The porosity of the membrane is 20% and the membrane thickness is 0.095 cm. The pores are also tortuous with a tortuosity of 1.25. The pressure drop across the membrane which drives the filtration flow is 2500 mmHg.The aqueous solution of acetic with a flow rate of 1000 kg/hr contains 30% acetic acid by mass and will be extracted in a countercurrent multistage process with pure isopropyl ether (IPE) to reduce the acetic acid concentration in the final raffinate phase (LN) to 2% by mass. a) Calculate the minimum solvent flow. b) Determine the theoretical number of steps required when using a solvent of 1.5 minimum solvent flow rate. c) Determine the number of theoretical steps using the McCabe-Thiele method. Chart. Acetic acid (A)-Water (B)-isopropyl ether (IPE) (C) LIQUID-Liquid Balances at 1 atm pressure and 293 K Water layer (%) Water (B) Isopropyl ether layer (%) Water (B) 0.6 Acetic acid (A) IPE (C) Acetic acid (A) IPE (C) 98.8 1.2 99.4 99.3 98.9 0.69 98.1 1.2 0.18 0.5 1.41 97.1 1.5 0.37 0.7 2.89 95.5 1.6 0.79 98.4 91.7 1.9 1.0 97.1 6.42 13.30 25.50 36.70 1.9 93.3 4.82 11.40 2.3 84.4 71.1 3.4 3.9 84.7 71.5 21.60 31.10 58.9 4.4 6.9 58.1 48.7 10.6 10.8 45.1 37.1 44.30 46.40 16.5 36.20 15.1…