Using the Dumas method set-up, and eperiment was conducted using acetone ( MW=58.08). The mass of the empty 250ml flask is 351.25 g it was filled with 25 ml of the volatile acetone and coverd with an parafilm. with a small pinhole. It was heated and alter on sealed sealed after the liquid is fully evaporated. The heated flask weigh 354.53. What is the sealing temperature?
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- 6. A volatilization gravimetry experiment was conducted on an unknown organic liquid (presumed to only contain carbon, hydrogen, and oxygen). The liquid was massed (data in the first column below) and then combusted in an excess of oxygen. The exhaust gas was passed through a trap containing drierite and then through a trap containing ascarite. The starting and ending masses of the drierite and ascarite were used to obtain the data in the second two columns below. Mass Unknown 12.4370 12.5590 12.2230 Mass CO2 17.0822 17.2497 16.7882 Mass H₂O 13.9849 14.1221 13.7443 A.) Calculate the mass percent of carbon, hydrogen, and oxygen in the unknown liquid. There are no outliers, so you can average the data before processing, if you wish. B.) Calculate the empirical formula of the unknown compound.A feed mixture containing 50 wt% n-heptane and 50 wt% methyl cyclohexane (MCH) is to be separated by liquid-liquid extraction into one product containing 92.5 wt% methylcyclohexane and another containing 7.5 wt% methylcyclo- hexane. Aniline will be used as the solvent. (a) What is the minimum number of theoretical stages necessary to effect this separation? (b) What is the minimum extract reflux ratio? (c) If the reflux ratio is 7.0, how many theoretical contacts will be required? Liquid-liquid equilibrium data for the system n-heptane-methyl cyclohexane-aniline at 25°C and at 1 atm (101 kPa) Hydrocarbon Layer Solvent Layer Weight percent MCH, solvent- free basis Pounds aniline/ pound solvent- free mixture Pounds aniline/ Weight percent MCH, solvent- free basis pound solvent- free mixture 0.0 0.0799 0.0 9.9 20.2 23.9 0.0836 0.087 0.0894 15.12 13.72 11.5 11.8 33.8 37.0 50.6 60.0 11.34 36.9 0.094 9.98 9.0 8.09 44.5 0.0952 0.0989 0.1062 50.5 67.3 66.0 76.7 84.3 88.8 6.83 74.6 79.7 82.1…Using the Dumas method set-up, and eperiment was conducted using acetone ( MW=58.08). The mass of the empty 250ml flask is 351.74 g it was filled with 25 ml of the volatile acetone and coverd with an parafilm. with a small pinhole. It was heated and alter on sealed sealed after the liquid is fully evaporated. The heated flask weigh 354.4. What is the sealing temperature? Answers in 2 decimal places no need to write the unit
- Tooling for a vacuum deposition system is cleaned and reassembled. Unfortunately, a drop of water 0.125 cm3 in volume is left in the bottom of a screw hole. Due to the obstructed path to the pump, a negligible amount of water escapes during the early stages of pumpdown, and the drop becomes a virtual leak at a chamber pressure of 4.3E-06 torr. Find the volume of gas formed by the water at this pressure (assume it stays at room temperature). The density of water is 1g cm-3 and the molecular weight 18 g mole-1. (First, determine the number of moles in the drop of water, and use the ideal gas law to determine the volume)(b) To make this result clearer, what is the added time (in hours) to pump out this chamber due to this droplet if the pump, at that pressure, has a rate of 1480 L/s?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 =percentage purity of an ibuprofen sample was determined by a reversed phase HPLC method as follows: Y Der ● A calibration curve of peak area versus concentration (ug/mL) of pure ibuprofen was constructed The ibuprofen sample for analysis was prepared by taking 10.0204 g of powder and dissolving it in/1Lbf distilled water (solution A). 1 ml of the latter solution was further diluted to IL with distilled water (solution B). Solution B was analysed by HPLC analysis Results The equation for the best-fit line of the calibration curve is: y=26820x-1323.8. ● The average peak area for the ibuprofen sample (solution B) was 266796.2 Calculate the percentage purity of the ibuprofen powder.
- Leaching of Oil from Soybeans in a Single Stage. Repeat Example 12.9-1 for single-stage leaching of oil from soybeans. The 100 kg of soybeans contains 22 wt % oil and the solvent feed is 80 kg of solvent containing 3 wt % soybean oi!. = 0.239, V, = 50.0 kg, x41 = 0.239, N, = 1.5 Ans. L, = 52.0 kg, ya1 wwwwwA sample of enzyme involved in alcohol metabolism, extracted and purified extensively from yeast cultures, was loaded onto a gel filtration column for molecular weight approximation. A set of protein standards with known molecular weight was eluted separately through the same column and suitable buffer following the elution of blue dextran for void volume determination. The following table summarizes the data obtained from the experiment: Elution flow rate 1 mL/min Sample collector setting Continuous; Sequential Container change rate 1 tube/min Sample/Standard eluted Test tube No/s. MW (Da) Blue dextran 4 2,000,000 Bovine thyroglobulin 11 669,000 Horse spleen apoferritin 14 443,000 Beta-amylase from sweet potato 21 200,000 Bovine serum albumin 27 66,000 Alcohol metabolism enzyme 19 ? 1. Process the given raw data in a tabular format of properly identified data points ready for calibration curve plotting. 2. Construct the calibration curve using MS Excel for use in MW determination.…Earth, a CHEM 40.1 student, extracted a mixture of pigments from the roots of Rubiatinctorum, commonly known as rose madder. Earth spotted the root extract on twohydrophobic silica gel plates. He then placed each plate in separate developing chambers,one containing solvent system WHITE and the other housing solvent system MIX. Earthallowed the chromatograms to develop for around five minutes. Afterwards, he removedthe plates from the containers and placed them inside an iodine chamber. Thechromatograms resulting from the TLC experiment after visualization are illustrated asfollows. The distances travelled by each spot and by the solvents were measured andrecorded in the displayed table.
- Barium titanate, a ceramic used in electronics, was analyzed by the following procedure: Into a Pt crucible was placed 1.2 g of Na₂CO3 and 0.8 g of Na₂BO7 plus 0.3124 g of unknown. After fusion at 1000°C in a furnace for 30 min, the cooled solid was extracted with 50 mL of 6 M HCl, transferred to a 100-mL volumetric flask, and diluted to the mark. A 25.00-mL aliquot was treated with 5 mL of 15% tartaric acid (which complexes Ti4+ and keeps it in aqueous solution) and 25 mL of ammonia buffer, pH 9.5. The solution was treated with organic reagents that complex Ba²+, and the Ba complex was extracted into CC14. After acidification (to release the Ba²+ from its organic complex), the Ba²+ was back-extracted into 0.1 M HC1. The final aqueous sample was treated with ammonia buffer and methylthymol blue (a metal ion indicator) and titrated with 32.42 mL of 0.01376 M EDTA. Find the weight percent of Ba in the ceramic. weight percent of Ba: wt%what are key reactions involved in seperation of liquid mixtures by simple and fractional distillation and gas chromatography? chemicals used: 10ml 1:1 mixture of ethyl and butyl acetate techniques: simple and fractional distillation, gas chromatography. target molecules: Ethyl acetate C4H8O2 Butyl acetate C6H12O2Common soda-lime-silica glass is made by melting together Na2CO3, CaCO3, and SiO2. The carbonates break down, liberating CO2 gas bubbles that help to mix the molten glass. For 1,000 kg of container glass (15 wt% Na2O, 10 wt% CaO, 75 wt % SiO2), calculate the raw material batch formula. What is the weight percent of SiO2?