Calcium stearate (Ca(OOC(CH2)16CH3)2) is sometimes used as a lubricant in the processing of poly(vinyl chloride). A sample of PVC compound containing 2 wt% calcium stearate was found to have Mn = 25,000. What is Mn of the balance of the PVC compound? %3D
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- Aluminum percent in a bauxite sample is determined by gravimetric analysis. 8-hydroxyquinoline (oxine) reacts w/aluminum to form Al(C9H6ON)3 precipitate. A 1.2 g sample yielded 0.16 g of the precipitate. What is the % aluminum w/w?What is the composition, in atom percent, of an alloy that consists of 30 wt% Zn and 70 wt% Cu? What is the composition, in weight percent, of an alloy that consists of 6 at% Pb and 94 at% Sn? Calculate the composition, in weight percent, of an alloy that contains 218.0 kg titanium, 14.6 kg aluminum, and 9.7 kg vanadium. What is the composition, in atom percent, of an alloy that contains 98 g tin and 65 g lead? What is the composition, in atom percent, of an alloy that contains 99.7 lbm copper, 102 Ibm zinc, and 2.1 lbm lead?A 500.00 mg vitamin C (MW 176.12 g/mol) tablet was ground, acidified and dissolved in H2O to make a 250.0 mL solution. A 25.00 mL aliquot containing vitamin C, KI and starch was analyzed and titrated with 10.10 mL of 0.009128 M KIO3. what is the % vitamin C in the tablet. Answer = 97.42%
- Five white, 500-mg uncoated ascorbic acid (AA) tablets with an average weight of 0.6100-g were pulverized in a mortar. A sample of the powdered ascorbic acid weighing 0.4610-g was placed in an iodine flask and was dissolved in 50-mL H2SO4 then 5-g of KBr was added to the resulting solution. The solution was titrated with 46.73-mL of 0.0152 M STD. KBrO3 to reach a faint yellow endpoint then 3-g KI and 5-mL Starch TS. The blue color solution is then titrated with 2.78-mL of 0.1047 M STD. Na2S2O3 to reach the disappearance of the blue iodostarch complex. MW: KBrO3 = 167.0 ; KIO3 = 214.0 ; Na2S2O3 = 158.11 ; C6H8O6 = 176.12 Compute the milligrams of pure AA per tablet from the assay. None of the choices 349.7 mg 264.3 mg 462.7 mgA 1.250 g sample of bauxite (the primary ore of aluminum) was analyzed for aluminum. The sample was powderized and treated in concentrated nitric acid. The nitric acid was removed and solids were treated in hot water with added nitric acid. Insoluble solids were removed by gravity filtration. The solution was made basic by the slow addition of dilute ammonia forming the gelatinous precipitate (Al(OH), and Al,O,.x H2O). The precipitate was heated to coagulate it then filtered over filter paper. The paper and solids were placed in a porcelain crucible and the paper was ashed while the precipitate was ignited at 600°C to convert the precipitate to pure Al,O,. The mass of Al,O, recovered was 0.2890 g. The average mass of ash after charring 10 sheets of the identical filter paper was 0.0007 g. Calculate the percent aluminum in the bauxite ore sample.The calcium (AW= 40.08 g/mol) from a sample of limestone weighing 607.4 mg was precipitated as calcium oxalate hydrate (CaC204.H20, FW 146.12 g/mol) and ignited to calcium carbonate (CaCO3, FW= 100.09 g/mol) weighing 246.7 mg. (c) If the precipitate had been ignited at a higher temperature giving calcium oxide (CaO, FW= 56.08 g/mol), what would be its weight?
- Toxic Cr(VI) can be precipitated from an aqueous solution by bubbling SO2 through the solution. How much SO2 is required to treat 3.00 x 10° Lof 5.00x102 mMCr(VI)? 2Cro + 3S0, + 4H* Cr (SO,),+2H,0 2C:0- Cr,(SO,)3 + 2H,0 kgA 20.330 g sample of aqueous waste leaving a fertilizer manufacturer contains ammonia. The sample is diluted with 74.044 g of water. A 10.245 g aliquot of this solution is then titrated with 0.1074 M HCl. It required 29.47 mL of the HCl solution to reach the methyl red endpoint. Calculate the weight percent NH, in the aqueous waste. wt% NH3 = APR 9 $ 4 R dº 10 % . 5 Search or type URL n T tv < 60 ♫ MacBook Pro A Y & N 7 907 U * 8 00 + I A ( 9 © | O - O W P J { + [ % ] deleteToluene, C7H8 , is burned with 30% excess air. A bad burner causes 15% of the carbon to form soot (pure C) deposited on the walls of the furnace. What is the Orsat analysis of the gases leaving the furnace
- We want to determine the purity of alum sample bought in a local pharmacy in Miagao. A Chem 28 student determined the purity gravimetrically of a sample of alum, K2SO4:Al2(SO4)3:24H20. A 1.5879-g sample was dissolved and the aluminum precipitated as Al(OH)3. The precipitate was collected by filtration, washed, and ignited to give a product Al203 weighing 0.1572 g. Show your calculation to determine the purity of the alum sample.A quantitative analysis for ethanol, C2H60, is accomplished by a redox back titration. Ethanol is oxidized to acetic acid, C2H402, using excess dichromate, 2- Cr207, which is reduced to Cr3*. The excess dichromate is titrated with Fe2+, of a brandy is diluted to 500 mL in a volumetric flask. A 10.00-mL sample is taken and the ethanol is removed by distillation and collected in 50.00 mL of an giving Cr3+ as products. Ina typical analysis, a 5.00-mL sample and Fe3+ acidified solution of 0.0200 M K2Cr207. Titration of the unreacted Cr207 requires 21.48 mL of 0.1014 M Fe2*. Calculate the %w/v ethanol in the brandy. 2- Which is the analyte in this problem? C2H60 O Cr207 2- C2H402 Fe2+A 0.2795-g sample of an organic mixture containing only C6H6Cl6 (290.83 g/mol) and C14H9Cl5 (354.49 g/mol) was burned in a stream of oxygen in a in a quartz tubeb. The products (CO2, H2O and HCl) were passed through a solution of NaHCO3. After acidification, the chloride in the solution yielded 0.7161 g of AgCl (143.32 g/mol). Calculate the percentage of each halogen compound in the sample. A mixture containing only FeCl3 (162.21) and AlCl3 (133.34) weighs 5.95 g. The chlorides areconverted to the hydrous oxides and ignited to Fe2O3 (159.69) and Al2O3 (101.96) The oxidesmixture weighs 2.62 g. Calculate the percent Fe (55.85) and Al (26.98) in the original mixture.