This corresponds to a naphthalene hydrogenation rate of 1-2410 3 mol/(kg cat s). It is best known as the main ingredient of traditional mothballs Ask a . What is the mass percent of carbon in the compound . The mass flux of naphthalene was substantially reduced by the MGPC . 40% CaCO3. From this we must calculate the mass percentage of solute. Chemistry. Do not stir at this time. Mass of the original sample of mixture (g) 1.537 Mass of recovered naphthalene (9) 0.461 Mass of recovered 3-nitroaniline (g) 0.507 Mass of recovered benzoic acid (g) 0.507 (12pts) Calculations (3/3pts) % by mass of naphthalene in original sample 30.0 V (0/3pts) % by mass of 3-nitroaniline in original sample 30.0 (-3 pts) Incorrect. Naphthalene is soluble in methanol and insoluble in water. Plan We can calculate the mass percentage by using Equation 13.5. . The reaction was carried out in a slurry batch reactor using goethite as the Fe (III) source. Given: mass of sample and mass of combustion products Coupled with chromatographic methods, this powerful instrumental technique can be used to elucidate the composition of a complex sample and definitively identify constituents while offering the benefits of high-precision quantitative analysis and low detection limits. This paper is intended to be an introductory text on the naphthalene sublimation technique. Sample ID #74 Mass of Vial with sample 12.00g Mass of Empty Vial 10.00g Mass of Sample 2.00g Mass of 100 mL round-bottom flask 67 . A 3.000-mg sample of naphthalene burns to give 10.3 mg of CO 2. [] screened fruit and vegetable samples for 251 known pesticides by extracting pulp with solvent before clean-up on solid phase extraction cartridges.The final extract was pre-concentrated and analysed by GC-MS or LC-fluorescence. 205M. The aim of this study was to evaluate the impact of biofield energy treatment on the isotopic abundance of 13 C/ 12 C or 2 H/ 1 H and 18 O/ 16 O in naphthalene and 2-naphthol using gas chromatography-mass spectrometry (GC-MS). 19 Researchers determined an LD 50 of 353.6 mg/kg for female CD-1 mice based on an 8-day oral exposure. Each step produced an organic layer as well as an aqueous layer. Follow your professors instructions. Quantitative detection of trace perfluorinated compounds in environmental water samples by Matrix-assisted Laser Desorption/Ionization-Time of Flight Mass Spectrometry with 1,8-bis(tetramethylguanidino)-naphthalene as matrix. What are the empirical and molecular formulas of the compound? A 0.025-g sample of a compound composed of boron and hydrogen, with a molecular mass of ~28 amu, burns spontaneously when exposed to air, producing 0.063 g of B 2 O 3. Naphthalene appears to be more toxic to mice than rats. The use of mass spectrometry (MS) is becoming widespread and rather routine in all levels of industry, government, and academia. The mass of water evaporated is obtained by subtracting the mass of the anhydrous solid from the mass of the original hydrate (\ref{3}): . The percent yield was found by dividing the mass of the recovered solids by the mass of the mixture, then multiplying the answer by 100. Determine its empirical and molecular formulas. Naphthalene, the active ingredient in one variety of mothballs, is an organic compound that contains carbon and hydrogen only. Calculations Total mass of original mixture- 1.02g Mass of sand: 0.65 g Mass of salt- 0.233g Mass of calcium carbonate: 0.137g v, Density of naphthalene in . Attempt to get samples within 100 mg of the weight of the original sample. Spot 2: The sample of liquid mixture taken before the rotary evaporation/or re-crystallization. The air stream was combusted, and a flame ionization . A 0.5 g whole blood sample, 5 microL naphthalene, fluorene, and anthracene (50 microg/mL) as spiked standards, and 0.5 mL sodium hydroxide were placed . . To recrystallize the naphthalene, heat about 50 mL of the 3:1 methanol:water mixture almost to the boiling point on a steam bath (see p. 78 in LTOC). A 0.500 g sample of naphthalene (C10H8) is burned in a bomb calorimeter containing 650 . Keywords - Journal. Naphthalene, the active ingredient in one variety of mothballs, is an organic compound that contains carbon and hydrogen only. Solution: The chemical equation is KCl (aq)+AgNO3(aq) KNO3(aq) +AgCl (s) By the end, we should have had the separated benzoic acid, aniline, and naphthalene. Using the same sample, now with the unknown in it: melt and solidify the mixture, recording a second set of data with Mass of NH 4Cl in original sample _____ 6. Mass of original sample _____ 4. Created by Sal Khan. Naphthalene (C ioH 8) is employed in the mass transfer experiments because of some of its properties, such as the fact that it sublimes at room temperature, its low toxicity, and its good casting and machining properties. 7. The vapor pressure of pure hexane at chem 121 We did a lab separating out the components of a mixture. To the sample, add approximately 50 mL of laboratory water and stir continuously with a glass stirring rod for about two minutes. After a second heating cycle, the mass of the sample and the dish is 14.78 g. The student stops the heat/cool/weigh cycle after the second time. A student decides to change the procedure for a lab, attempting to determine the mass of naphthalene in the sample by collecting the solid scrapings from the evaporating dish and weighing them directly (as opposed to weighing the beaker before and after sublimation). A 1.60 g sample of a mixture of naphthalene, C10H8, and anthracene, C14H10, is dissolved in 20.0 g benzene, C6H6. A.O.I. Samples 1 to 3 were collected at ecological park sites and are thus close to the background concentrations of naphthalene for urban and suburban centers, which can vary from 0.001 to 1 g/m 3, . Need some help here: 1. The percentage yield for this experiment was 88.314%. 1,2 It is an insecticide that is also used as a repellent. Rautanen, . We did a lab separating out the components of a mixture. A 3.000-mg sample of naphthalene burns to give 10.3 mg of CO 2. chem 121. . chemistry. Determine its empirical formula. What are the empirical and molecular formulas of the compound? The freezing point of the solution is 2.81C. 17 Naphthalene is considered low in toxicity by . Z Local sublimation depth, m. t Time duration of the test, s. m Difference in weights of the specimen, g. As Area of naphthalene surface, m 2. The makeup of that 88.314% is divided between naphthalene at 4.550%, NaCl at 39.368%, and sea sand at 44.397%. Spot 3: A few crystals of naphthalene product in 1 mL ethyl acetate. Naphthalene | C10H8 | CID 931 - structure, chemical names, physical and chemical properties, classification, patents, literature, biological activities, safety . Given: mass of sample and mass of combustion products Naphthalene is a bicyclic aromatic hydrocarbon derived from coal tar or crude oil. The naphthalene yield was much lower, . % by mass of 3-nitroaniline in original sample. The percent yield was not 100%, which proved that something from the original sample had been removed. b. Mass of dish #1 plus NaCl and SiO 2 _____ 5. 4 The Chemical Abstracts Service (CAS) registry number is 91-20-3. A package of freshly picked sweet peas has a mass of 454 g (1 lb.). Many organic solvents, like ether and dichloromethane . All samples showed concentrations above the limit of quantification, except for samples 2 and 3 of the outdoor air. Normalize to obtain the empirical formula and then use the molecular mass to determine the actual molecular formula. Determine the empirical formula of naphthalene. 82) A sample of 0.6760 g of an unknown compound containing barium ions (Ba2+) is dissolved in water and treated with excess Na2SO4. Freezing point depression provides a convenient way to determine the molar mass of an unknown substance. . Previous studies using Cyp2abfgs-null (lacking all genes of the Cyp2a, 2b, 2f, 2g, and 2s subfamilies), CYP2A13/2F1-humanized, and liver-Cpr-null (LCN) mice showed that although hepatic cytochrome P450 (P450) enzymes are essential for systemic clearance of inhaled naphthalene (a possible human carcinogen), both hepatic and extrahepatic P450 enzymes may contribute to naphthalene-induced lung . It is the simplest polycyclic aromatic hydrocarbon, and is a white crystalline solid with a characteristic odor that is detectable at concentrations as low as 0.08 ppm by mass. It will dissolve in a hot mixture of 3:1 methanol:water but is less soluble when this mixture is cold. Discussion: During World War 2, one of the major problems scientists faced . A package of freshly picked sweet peas has a mass of 454 g (1 lb.). -naphthalene as matrix Authors. 20. How much heat is needed to convert 10g ice to 10g water vapor? % by mass of naphthalene in original sample. Naphthalene, the active ingredient in one variety of mothballs, is an organic compound that contains carbon and hydrogen only. Sample Exercise 13.3 Converting Units of Temperature Solution (a) Analyze We are given the number of grams of solute (13.5 g) and the number of grams of solvent (0.100 kg = 100 g). If the mass of the BaSO4 precipitate formed is 0.4105 g, what is the percent by mass of Ba in the original unknown compound? (Sub)clinical endpoint measures included nasal endoscopy, smell sensitivity, self-reported work-related complaints and the intensity of naphthalene odor and irritation. A 1.60 g sample of a mixture of naphthalene, C10H8, and anthracene, C14H10, is dissolved in 20.0 g benzene, C6H6. The principal component of mothballs is naphthalene, a compound with a molecular mass of about 130 amu, containing only carbon and hydrogen. Methods of pesticide analyses have been largely driven by the food industry [1-3].In their comprehensive paper of 2000, Filion et al. Using the technique of weighing by difference, weigh out a 0.7 g sample of NaCl. The naphthalene was the scraped into a vial with no cap and left to stand and dry for a week before determining the melting point. Naphthalene conversion (naphthalene hydrogenated to tetralin, octalins and decalins) varied from 4 to 96%. Determine the empirical formula of naphthalene. View Calculation.pdf from CHM chm1321 at University of Ottawa. Record the mass and number or letter of the unknown on the data sheet and place the unknown in the test tube containing your original sample of naphthalene. P.A. Subtract to find the mass of NaCl in the original mixture. The original mass of the 50:50 mixture measured was 2.042g, and assuming it is truly 50:50, it can be anticipated that the mass of both naphthalene and benzoic acid was 1.021g. The percent composition for each component is: 16.5g carbohydrates / 130.g x 100 = 12.7% carbohydrates, 9.7g sugar / 130.g peas x 100 = 7.5% sugars, 8.1g dietary fiber / 130.g peas x 100 = 6.2% dietary fibers, 4.4g protein / 130.g peas x 100 = 3.4% protein, The sample should be transferred to a beaker. . Nearest whole multiple is 5, resulting in ratio of 6:5. Krause, in Studies in Surface Science and Catalysis, 2001 3.3 Naphthalene and Tetralin Conversion. . M 00 Local naphthalene mass flux, kg/s-m2. This mixture was then to be separated using 5% HCl, 5% NaOH, 6M NaOH, and 6M HCl. Determine its empirical and molecular formulas. Chemistry questions and answers. Prepare the sample and charge the oxygen combustion vessel as described in Instruction Manual No. Subtract this number and the mass of the salt from the original total mass will help you find the mass of the sand. The number of moles of solute can be determined by rearranging Eq. Upload a picture of your drawn separation scheme for benzoic acid from the . View more similar questions or ask a new question. . A 1.60 g sample of a mixture of naphthalene, C10H8, and anthracene, C14H10, is dissolved in 20.0 g benzene, C6H6. Mass of the original sample of mixture (g) 1.571 Mass of recovered naphthalene (g) 0.518 Mass of recovered 3-nitroaniline (g) 0.487 Mass of recovered benzoic acid (g) 0.505 Required: a. The same explanations hold true for . The reaction taking place is. Elemental analysis can be used to determine the amounts of substances in a mixture. After drying the flask was re-massed and the mass of naphthalene was determined. the purity of the naphthalene fraction changes over the course of the extraction. A student found that the mass of the naphthalene collected was less than the mass determined by difference. Given: mass of sample and mass of combustion products Pure Benzene freezes at 5.51C and has a Kf = 5.12C kg/mol. T f,solution T f,solvent = T f = K f . Q: % by mass of naphthalene in original sample % by mass of 3-nitroaniline in original sample % by mass A: Given mass of the original sample of mixture (g)= 1.547 mass of recovered naphthalene (g) = 0.511 [13] As an aromatic hydrocarbon, naphthalene's structure consists of a fused pair of benzene rings. Linear regressions passing the original point were applied for all the sorbents under the range of naphthalene concentration (1 ppm-40 ppm).

Weigh a clean and dry 250-mL beaker (Beaker #2). Vapor pressure measurements can be used to find the mass of naphthalene transferred from the sample to a stream of gas passed over . A solution contains naphthalene (C10H8) dissolved in hexane (C6H14) at a concentration of 14.52 % naphthalene by mass.Calculate the vapor pressure at 25 degrees C of hexane above the solution. used to weigh the beaker and watch glass. The freezing point of the solution is 2.81oC. A solution containing a known mass of solute per mass of solvent is prepared and its freezing point is measured. Naphthalene, the active ingredient in one variety of mothballs, is an organic compound that contains carbon and hydrogen only. Determine the empirical formula of naphthalene.

93.91/12 = 7.83 relative moles of carbon 6.29/1 = 6.29 relative moles of hydrogen Ratio of C:H is 7.83:6.29 or 1.2. SPQ2.B (LO) , SPQ2.B.1 (EK) Transcript. Experiment: We obtained 3.1 grams of the benzoic acid, aniline, and naphthalene mixture. These data were obtained by passing air over a sample of the sub-stance in a tube. and potassium chloride (KCl) has a total mass of 4.000g. CHROMATOGRAPHY is the process of separating a mixture by the . The highest concentrations . 3 Determine the empirical formula of naphthalene. Calculate the percent composition for each of the components. Calculate the change in mass for each sample. Plate A: Spot 1: A few crystals, ~0.001g/mL, benzoic acid product in 1 mL ethyl acetate. Naphthalene Naphthalene is an organic compound with formula C 10 H 8. The extracted naphthalene/hexane samples were analyzed by gas chromatography equipped with flame ionization detector (GC-FID). A 3.000-mg sample of naphthalene burns to give 10.3 mg of CO2. tt. Determine the empirical formula of naphthalene. Determine the percent by mass of each component on your mixture using the following formula: mass of component A % of component A x 100% mass of original sample ring stand 1) Will weighing the collected (scraped) naphthalene Given: mass of sample and mass of combustion products C5H4 C10H8 C2H3 None of these Record exact mass. Mass of dish #1 plus dry SiO . 3. What was the % by mass of CaCO3 in the original sample? As an aromatic hydrocarbon, naphthalene's structure consists of a fused pair of benzene rings. Iodine (I2), naphthalene (C10H8, mothballs), ammonium chloride (NH4Cl) and dry ice (solid CO2) are some substances which sublime. A solution contains naphthalene(C10H8) dissolved in hexane (C6H14) at a concentration of 14.52 % naphthalene by mass.Calculate the vapor pressure at 25 degrees C of hexane above the solution. When the reaction ends, pour out the water and weighed the mass of the mixture on the digital scale. The freezing point of naphthalene is 80.2C. A student found that the mass of the naphthalene collected was less than the mass determined by difference. Homework Statement. Complete combustion of a 20.10 mg sample of naphthalene in oxygen yielded 69.00 mg of CO 2 and 11.30 mg of H 2 O. Lab 4 Separation of Benzoic Acid, 3-Nitroaniline, and Naphthalene Objectives Separate organic compounds based on functional groups Use pH changes to separate compounds Background Separations of Immiscible Liquids Throughout organic experiments, multiple different solvents get used, such as a variety of organic solvents and water. Calculate the percent by mass of KCl in the original sample. mass of oxygen = mass of sample - (mass of carbon plus mass of hydrogen) Since we burned 1.00 g of our sample, it follows that we can calculate the mass of oxygen by subtracting the combined masses of C and O from the mass of sample. Given: mass of sample and mass of combustion products A 0.573g sample of a nonvolatile solute is added to 15.6g of napthalene and the mixture warmed until melted. When a 1.00 grams sampleof this limestone is decomposed by heating, 268 cm3 of CO2 (g) is produced measured at 750. torr and 20C. An 887.0 mg sample of a mixture containing only NaCl and KCl is dissolved in water, and excess AgNO3 is added to yield 1.913 g of AgCl. When this sample is dissolved .

Extraction of markers (NAPF) from synthetic water and lake water samples. Naphthalene | C10H8 | CID 931 - structure, chemical names, physical and chemical properties, classification, patents, literature, biological activities, safety . 7. Thirtynine healthy and non-smoking male employees with either moderate (n = 22) or high (n = 17) exposure to naphthalene were compared to 22 male employees from the same plants with no or only rare exposure to naphthalene. Solution for 1. a) calculate % by mass of naphthalene, 3-nitroaniline and benzoic acid in original sample 1. b) calculate total mass of three recovered Calculation % by mass of naphthalene in original sample: (0.632 g/ 2.039 g) x 100 = 30.9955861% % by mass of 3-nitroaniline in original A substance is classified as efflorescent if its mass decreases by 0.005 g or more; and it is classified as hygroscopic if its mass increases by 0.005 g or more. For example, if elemental analysis tells us that a potassium supplement contains 22% K by mass, and we know that the K is present as KCl, we can calculate the grams of KCl in the supplement. The freezing point of the solution was determined and found equal to 78.1C. Dermal. A simple and sensitive method for the simultaneous analysis of naphthalene, fluorene, and anthracene in whole blood was developed using headspace-solid-phase microextraction (SPME) and GC/MS. The mass of the solution is the sum of . C_10H_8 Assuming that is a mass amount, divide each proportion by the atomic weight of the component. . This content was COPIED from BrainMass.com - View the original, and get the already-completed solution here! Ba2+(aq) + SO42-(aq) ( BaSO4(s) Complete combustion of a 20.10 mg sample of naphthalene in oxygen yielded 69.00 mg of CO 2 and 11.30 mg of H 2 O. Complete combustion of a 20.10 mg sample of naphthalene in oxygen yielded 69.00 mg of CO 2 and 11.30 mg of H 2 O. You dissolve 0.4500 g of impure potassium chloride in water and add an excess of silver nitrate. r Radial coordinate, m. Sh;Sh Local and average Sherwood number. 1. If the original mass of the evaporating dish and the hydrate was 21.71 g, and the mass of the evaporating dish alone was 1.315 g, what is the mass of water removed from the sample by heating? 3 Its International Union of Pure and Applied Chemistry (IUPAC) name is naphthalene. An additional experiment carried out with very low catalyst loading led to a low . Webinars; Posters; Hubs; . Thereby, adsorption of a sample on a catalyst may be observed .

"A 1.60 g sample of a mixture of naphtalene, C10H8. Naphthalene (NAP) has received particular attention due to its impact on the environment and human health, mandating its removal from water systems. A 0.025-g sample of a compound composed of boron and hydrogen, with a molecular mass of ~28 amu, burns spontaneously when exposed to air, producing 0.063 g of B 2 O 3. 2) Calculate the mass percent of NaHCO3 in the uknown mixture . Naphthalene, the active ingredient in one variety of mothballs, is an organic compound that contains carbon and hydrogen only. The peas were freeze dried and the . Let mixture stand for a few minutes to allow the undissolved components settle to the bottom of the mixture. c. % by mass of benzoic acid in original sample. % by mass of naphthalene in original sample. The molecular mass of naphthalene = 128.17 gm/mol The molecular mass of 3-nitro aniline = Complete combustion of a 20.10 mg sample of naphthalene in oxygen yielded 69.00 mg of CO 2 and 11.30 mg of H 2 O.

A student completed the experiment but found that the total amount of material recovered weighed more than the original sample. Complete combustion of a 20.10 mg sample of naphthalene in oxygen yielded 69.00 mg of CO 2 and 11.30 mg of H 2 O. Given: mass of sample and mass of combustion products . A student completed the experiment but found that the total amount of material recovered weighed more than the original sample. Record the sample weight data in your notebook in proper format. Naphthalene and 2-naphthol are two naphthalene derivatives, which play important roles in the chemical and pharmaceutical industries. (3pts) % by mass of naphthalene in original sample (3pts) % by mass of 3-nitroaniline in original sample (3pts) % by mass of benzoic acid in original sample (3pts) Total percent recovered Mass of the original sample of mixture (9) Mass of recovered naphthalene (9) Mass of recovered 3-nitroaniline (9) Mass of . After the extraction and recrystallization, 0.73g of benzoic acid and 0.502g of naphthalene were recovered. That is: mass of oxygen = 1.00 g - (0.409 g + 0.046 g) = 1.00 g - 0.455 g = 0.545 g. In this work, the abatement of NAP in the aqueous phase was achieved using persulfate (PS) activated by Fe (III) and monochromatic LED light at a natural pH. A study using CD-1 mice identified an acute oral LD 50 of 533 mg/kg in males and 710 mg/kg in females. You get 0.8402 g of insoluble silver chloride. Naphthalene is an organic compound with formula C 10 H 8.It is the simplest polycyclic aromatic hydrocarbon, and is a white crystalline solid with a characteristic odor that is detectable at concentrations as low as 0.08 ppm by mass. I need the correct answer please Mass of the original sample of mixture (g) 1.537 Mass of recovered naphthalene (9) 0.461 Mass of recovered 3-nitroaniline (g) 0.507 Mass of recovered benzoic acid (g) Q&A. . A 10 ml volume of a synthetic sample was extracted with 10 ml of dichloromethane in a 30 ml vial; the layers were allowed to separate.Prior to SPE work, 2-4 ml of the organic layer was removed and stored in a sealed glass vial at 4 C.The extraction of a river water sample was carried out essentially according to . 2. Mass of the original sample of mixture (g) 1.547 Mass of recovered naphthalene (g) 0.511 Mass of recovered 3-nitroaniline (g) 0.480 Mass of recovered benzoic acid (g) 0.472 % by mass of naphthalene in original sample % by mass of 3-nitroaniline in original sample % by mass of benzoic acid in original sample Total percent recovered. a) calculate % by mass of naphthalene, 3-nitroaniline and benzoic acid in original sample 1. b) A: 1)a. E. Percent by Mass. Naphthalene, the active ingredient in one variety of mothballs, is an organic compound that contains carbon and hydrogen only. Repeat three additional times. Local and average mass transfer coefficient, m/s. Calculate the mass of NaHCO3 present in the original mixture. All operations required to test a sample or to standardize the 1341 Plain Jacket Calorimeter should proceed step-wise in the following manner: 1. Methods. Determine the empirical formula of naphthalene. The peas were freeze dried and the . Not only was it evident that the impurities had been removed due to the color of the resultant Naphthalene, but it could also be seen in the difference between the starting mass and the mass retrieved. Data Collection Mass of the original sample of mixture (g) 1.558 Mass of recovered naphthalene (g) 0.483 Mass of recovered 3-nitroaniline (g) 0.499 Mass of recovered benzoic acid (g) 0.467 Calculations: a.

You may rinse the solid NaCl residue down the drain. Dolomitic limestone is a mixture of CaCO3 and MgCO3. 6-C . TALANTA Volume 85, Issue 1, Pages 345 . Determine the composition (mass percentage) of naphthalene-anthracene mixture?" Complete combustion of a 20.10 mg sample of naphthalene in oxygen yielded 69.00 mg of CO 2 and 11.30 mg of H 2 O. The vapor pressure of pure hexane at . 2. A 1.00 g sample of naphthalene (C10H8) contains 0.562 g of hydrogen. The dermal LD 50 was determined to be greater than 2000 mg/kg in rabbits. Add some of this hot solvent to 2.5. and anthracene, c14H10 is dissolveed in 20.0g of benzene, C6H6. . Fill the calorimeter bucket by first taring the dry bucket on a solution or trip balance .