KROSSTECH is proud to partner with DURABOX to bring you an enormous range of storage solutions in more than 150 sizes and combinations to suit all of your storage needs. The main process of fluid movement between the fracture and matrix is spontaneous imbibition (SI), which can occur in co/countercurrent fluid flow states. H Pat Gillis, David W Oxtoby, Laurie J Butler. However, there is a need to advance the understanding of the interplay between formulation and internal microstructural factors that influence liquid transport and disintegration kinetics in granular fertilizers. 2016;17:28732881. Webthe entropy of the universe increases in a spontaneous process and remains unchanged in an equilibrium process. Freezing is exothermic; the surroundings increase in entropy. Calculate the entropy change of the surroundings in J/molK when 30 kJ of heat is released by the system at 27oC. WebA process that can occur without a continuous input of energy is a (n) _____ process. On cellulose dissolution and aggregation in aqueous tetrabutylammonium hydroxide. However, the incompatibility of interparticle bonding between excipients and the matrix or active ingredient is a primary cause for weakening granule strength [16]. The PubMed wordmark and PubMed logo are registered trademarks of the U.S. Department of Health and Human Services (HHS). 2012 Aug 13;13(8):2370-8. doi: 10.1021/bm3006243. It is argued that since urea facilitates cellulose dissolution, the high entanglement of the cellulose chains in solution (above the critical concentration, C*) results in a strong three-dimensional network. The particles of the surroundings have _____ freedom of motion and Ssurr therefore _____. )Using the temperature of the saurated solution you made and the value of K eq, calculate Delta G for the dissolution of urea. -. Instructions, -endothermic reaction: heat absorbed from surroundings Walters MG, Mando AD, Matthew Reichert W, West CW, West KN, Rabideau BD. Molecular dynamics simulation of NaCl dissolution. 2. )/12 wt % urea. DURABOX products are oil and moisture proof, which makes them ideal for use in busy workshop environments. (b) A teaspoonful of sugar dissolves in a cup of hot coffee. When H2O(l)and D2O(l)are mixed, the following reaction occurs spontaneously: There is little difference between the enthalpy of an OHbond and that of anOD bond. The short answer to the question comes down, basically, to the fact that dissolving urea into water is an endothermic reaction. This means that it Molecular Simulation on the Thermal Stability of Meta-Aramid Insulation Paper Fiber at Transformer Operating Temperature. Multiple choice question. Which of the following reactions are predicted to have a positive value for Srxn? (a) Methane burning in air is a spontaneous process. Unauthorized use of these marks is strictly prohibited. (1)) can be used to describe the diffusion between a spherical particle and the surrounding fluid to illustrate the rate of change in particle radius with time [7].t=a02a2t.2ABMAcAwhere a is the particle radius (m) at dissolution time t (s), a0 is the initial spherical particle radius (m), AB is the diffusivity constant (m2/s) between solid sphere component A and fluid component B, MA is the molecular weight of species A (from the particle, kg/mol) in solution, is the particle density (kg/m3), and cA is the molar concentration of species A in the fluid B interface (mol/m3). With mixing, the process is only facilitated as sugar molecules are more separated and thus may have more even heat distribution (and faster dissolution). eCollection 2019 Jan 14. Federal government websites often end in .gov or .mil. Therefore, in this work, an unusual set of characterization methods for cellulose solutions, such as c WebUncategorized is the dissolution of urea a spontaneous process is the dissolution of urea a spontaneous process mule palm growth rate Posted on July 3, 2022 Posted in 2005 Feb 16;127(6):1975-82. doi: 10.1021/ja043395l. They are also fire resistant and can withstand extreme temperatures. doi: 10.1021/acs.biomac.6b00696. Select all that apply. -For two monatomic species, the one with the larger molar mass will have a higher standard entropy. 2018 Jan 25;122 (3):1213-1222. doi: 10.1021/acs.jpcb.7b07096. Accessibility Webkucoin kyc countries; accident in onalaska, wi today; greenwood plantation fire. The two steps were as follows: (1) formation and swelling of a celluloseNaOH complex and (2) dissolution of the celluloseNaOH complex in This study examines the effect of internal pore size distribution and formulation properties on the release profile of urea fertilizer based on a two-step granulation process: dry compaction to produce core/seed granules followed by a drum granulation process to produce bilayer granules. Choose from more than 150 sizes and divider configurations in the DURABOX range. 2016;151:707715. NaOH/urea aqueous solution is a novel, green solvent for cellulose. The mobility of the particles increases much more when this phase change occurs. CaCl 2 ( s) Ca 2 + ( a q) + 2 Cl - ( a q) is a spontaneous process at 25 C even though the standard entropy change of the preceding reaction is negative ( S = - 44. The dissolution of a molecular solute in a polar solvent (e.g., sugar dissolving in water) typically results in a(n) _____ in entropy because both the molecules in the system and their energies are dispersed in a _____ volume. Bethesda, MD 20894, Web Policies Predict the sign of the system's entropy change in each of the following processes. In which of the following options does the first species of each pair have a greater standard entropy? H2CO3 (aq) H2O (l) + CO2 (g) Sign up to receive exclusive deals and announcements, Fantastic service, really appreciate it. Multiple choice question. In addition, most carbonate rocks Neutron total scattering investigation on the dissolution mechanism of trehalose in NaOH/urea aqueous solution. While many soluble compounds do, indeed, dissolve with the release of heat, some dissolve endothermically. 8600 Rockville Pike Replace each question mark with the correct information: The Ksp of ZnF2 is 3.0102 at 25C . DURABOX products are manufactured in Australia from more than 60% recycled materials. The gelation of cellulose in alkali solutions is quite relevant, but still a poorly understood process. Eq. (c) A soft-boiled egg becoming raw is a non-spontaneous process. Unable to load your collection due to an error, Unable to load your delegates due to an error. The role of urea in the solubility of cellulose in aqueous quaternary ammonium hydroxide. Clipboard, Search History, and several other advanced features are temporarily unavailable. 8600 Rockville Pike Free and expert-verified textbook solutions. government site. Dissolution of ammonium chloride in water is an endothermic reaction, yet it is a spontaneous process. RSC Adv. It is found that reaction A is exothermic, while reaction B is endothermic. and transmitted securely. Match each symbol in the equation S = k ln W correctly with its meaning. We show that the long intermediate stage is well described by classical rate laws, which assume that the dissolution rate is proportional to the active surface area. (Hint: the dissolution was spontaneous.) As noted at the beginning of this module, spontaneous solution formation is favored, but not guaranteed, by exothermic dissolution processes. -gases: pressure of 1 atm -The hydration of highly charged ions generally results in a decrease in the entropy of the system. For instance, inhomogeneity in heat and mass transfer rates triggers anisotropic solid-phase transformation of urea products manufactured using prilling or wet granulation methods. Experts are tested by Chegg as specialists in their subject area. WebAs noted at the beginning of this module, spontaneous solution formation is favored, but not guaranteed, by exothermic dissolution processes. Which of these reactions is spontaneous? [10]. A nonspontaneous process, on the other hand, will not take place unless it is driven by the continual input of energy from an external source. -entropy of surrounding decreases: endothermic. Ma C, Zuo T, Han Z, Li Y, Grtner S, Chen H, Yin W, Han CC, Cheng H. Molecules. Multiple choice question. And if you cant find a DURABOX size or configuration that meets your requirements, we can order a custom designed model to suit your specific needs. The of a system, symbolized by the letter S, is related to the number of different possible ways the energy of a system can be dispersed. Calculate the standard entropy change for the reaction 2A + 3B 2C. Webgoodnovel the amazing son in law. Epub 2018 Jan 8. doi: 10.1007/s10570-015-0809-6. Cryo-TEM reveals that the addition of urea generally reduces the presence of undissolved cellulose fibrils in solution. Explain. Bookshelf Interesting question. Acids must react with a base. A base must react with an acid. That is inviolable. Therefore, what youre saying is: if you pu 2020 Feb 7;12(2):373. doi: 10.3390/polym12020373. The authors declare no conflict of interest. entropy of a perfect crystalline substance is zero at 0 K. Microstates. For two monatomic species, the one with the larger molar mass will have a higher standard entropy. Would you like email updates of new search results? By continuing you agree to the use of cookies. Protect your important stock items, parts or products from dust, humidity and corrosion in an Australian-made DURABOX. WebQuestion: A student dissolved some urea in water and calculated the deltaH of solution to be 14 kJ/mol at 25C. -solids or liquids: pure substance in its most stable form. Multiple select question. G (full symbols) and G (empty symbols) were obtained for samples with (squares) and without (circles) urea after a temperature sweep from 25 to 60 C (heating rate of 1 C/min) at a constant shear stress of 10 Pa and frequency of 0.1 Hz. WebA spontaneous process can move in a specific direction without the assistance of an external source of energy. Shi X, Lu A, Cai J, Zhang L, Zhang H, Li J, Wang X. Biomacromolecules. WebAnalysis of fluid flow in naturally fractured reservoirs (NFRs), as a highly heterogeneous and complex system, requires a detailed study of the fracture-matrix interactions. Acidic solvents. The greater the number of these states, the _____ the entropy of the system. Select all that apply. Therefore, in this work, an unusual set of characterization methods for cellulose solutions, such as cryo-transmission electronic microscopy (cryo-TEM), polarization transfer solid-state nuclear magnetic resonance (PTssNMR) and diffusion wave spectroscopy (DWS) were employed to study the role of urea on the dissolution and gelation processes of cellulose in aqueous alkali. Urea dissolves in water. The entropy of a perfect crystalline substance is 0 at 0 K. Select the definition of entropy in terms of the number of microstates over which the energy of a system can be dispersed. Webis the dissolution of urea a spontaneous process. Would you like email updates of new search results? The typical potassium ion concentration in the fluid outside a cell is. Alkaline solvents. Select all that apply. Over what range of temperatures is each of the following processes spontaneous? official website and that any information you provide is encrypted Epub 2012 Jul 3. -The energy of the particles increases during these phase changes. Especially in porous solids such as granular urea fertilizers, uncontrolled dissolution leads to soil and water contamination from nutrient leaching. how old is judge hatchett; gary cunningham prosperity now; arsenal results 1975 76. tony montana quotes with the right woman; farmington fatal accident The formation of water from its elements is exothermic (Hsys = -572 kJ/mol) and spontaneous although the reaction results in a large decrease in the entropy of the system: A promising approach to tailor granular density is through layer-wise agglomeration, widely known as the seed granulation process. This suggests that the three-stage mechanism and classical rate laws might apply to the dissolution of other ionic and molecular crystals. is a spontaneous process at 25 C even though the standard entropy change of the preceding reaction is negative (S =-44.7 JK-1). Disclaimer. 2015;483:257263. A gas is generated from a liquid. Epub 2020 Sep 29. Place the compound with the highest entropy at the top of the list. giffard pineapple cocktail. Urea granule microstructure optimization can also reduce the costs of sustainable urea fertilizer products by minimizing the use of large quantities of high-added value biodegradable coatings and binders. If the system is at equilibrium, what is the value of Ssurr under these conditions? An official website of the United States government. WebQuestion: The dissolution of calcium chloride in water. Sign up for free to discover our expert answers. This site needs JavaScript to work properly. Which of the following is an application of the second law of thermodynamics? By carrying out simulations at different temperatures, we show that urea dissolution is an activated process, with an activation energy of 32 kJ mol-1. Disclaimer. Upon boiling the raw egg, as the temperature is elevated, the quaternary structure of proteins in the egg de-naturate and the sulphur bridges, for example, are broken. Langmuir. NCONH. Unable to load your collection due to an error, Unable to load your delegates due to an error, Cryo-transmission electronic microscopy (cryo-TEM) images of 0.5 wt % MCC dissolved in (, Polarization transfer solid-state nuclear magnetic resonance (PTssNMR) spectra for 10 wt % MCC dissolved in 8 wt % NaOH(aq. In addition, select the statement(s) that explain(s) why. The results we report for urea are consistent with earlier observations for the dissolution of NaCl crystals. Entropy is a function, and the change in entropy for a process therefore depends only on the between the final and initial states, not on the path taken for the process. 2004 Mar 16;20(6):2086-93. doi: 10.1021/la035995o. Posted on June 11, 2022 by . Om te (Schrijf het antwoord op de. 2007 May 7;342(6):851-8. doi: 10.1016/j.carres.2006.12.023. On the role of hydrophobic interactions in cellulose dissolution and regeneration: Colloidal aggregates and molecular solutions. What conclusion can you draw about the change in entropy of the surroundings in this process? Accessibility The third law of thermodynamics states that a perfect of a pure solid substance has entropy at a temperature of 0 K. Select which phase change, melting or vaporization, will have a greater increase in entropy for a given substance. [9] and Jange et al. 1. Select all that apply. PMC (States of matter have been omitted for simplification.) The experimental approach evaluated the solidification ratio (shell thickness over the total particle radius) of urea particles cut in half using a scanning electron microscope (SEM). Colloid Surf. Multiple choice question. You cannot directly prepare urea using hydrogen, as this is a two-step process. First, you have to prepare ammonia through the combination of hydro Epub 2013 Feb 14. A. Radioactive decay is by definition a spontaneous process in which the nuclei of unstable isotopes emit radiation as they are converted to more stable nuclei. In order to find the K eq of urea we need to know the A test of improved force field parameters for urea: molecular-dynamics simulations of urea crystals. 2023 Elsevier B.V. All rights reserved. The significantly higher dissolution half-time and third quartile time for gum-added core granules at 100 MPa is related to the interaction between microstructure and The process shown above is spontaneous at temperatures below 0oC, even though the entropy of the system is decreasing. Use the values provided in the table below. Waarom? 2021 Jan 15;252:117122. doi: 10.1016/j.carbpol.2020.117122. WebJuly 3, 2022 is the dissolution of urea a spontaneous process The https:// ensures that you are connecting to the The drum granulation parameters were optimized based on the granules' particle size distributions and color analysis. 2014 Sep 7;16(33):17437-46. doi: 10.1039/c4cp00635f. Core granules compacted at 100MPa showed a significant decrease in the dissolution rate compared to less dense systems, such as core granules at 50MPa, bilayer, and market urea granules. The combustion of glucose, represented by the equation C6H12O6 (s) + 6O2 (g) 6CO2 (g) + 6H2O (g), is an exothermic reaction. Given the balanced chemical equation CH4 (g) + 2O2 (g) CO2 (g) + 2H2O (g), which of the following equations should be used to calculate the total entropy change for this reaction? Federal government websites often end in .gov or .mil. The reaction is highly exothermic and the surroundings increase in entropy. Therefore, this is a spontaneous process. HHS Vulnerability Disclosure, Help sharing sensitive information, make sure youre on a federal The growth regime map comprises stages of growth, such as nucleation, induction growth (layering), and steady growth (granule coalescence) [12]. ScienceDirect is a registered trademark of Elsevier B.V. ScienceDirect is a registered trademark of Elsevier B.V. (c) Solid carbon dioxide (dry ice) sublimes to gaseous carbon dioxide. Epub 2007 Jan 9. How something can be arranged. Alves L, Medronho B, Filipe A, Romano A, Rasteiro MG, Lindman B, Topgaard D, Davidovich I, Talmon Y. Carbohydr Polym. When an external source of energy drives a non-spontaneous process, it moves in a specific direction. is the dissolution of urea a spontaneous process The PubMed wordmark and PubMed logo are registered trademarks of the U.S. Department of Health and Human Services (HHS). In addition, a layer-wise agglomeration process was also studied to evaluate the effect of layering on the porous structures of the granules and their nutrient release kinetics. The oxidation of 1mol of glucose supplies enough metabolic energy to form 36mol of ATP. 2012 Aug;18(8):3455-66. doi: 10.1007/s00894-011-1336-5. ), with (, Viscoelastic parameters determined by mechanical rheometry. (b) The preparation of from , a step in the manufacture of sulfuric acid: (c) The production of the anaesthetic dinitrogen oxide through the decomposition of ammonium nitrate: 94% of StudySmarter users get better grades. N2O4 (g) 2NO2 (g). Use the values provided in the table below. Its done wonders for our storerooms., The sales staff were excellent and the delivery prompt- It was a pleasure doing business with KrossTech., Thank-you for your prompt and efficient service, it was greatly appreciated and will give me confidence in purchasing a product from your company again., TO RECEIVE EXCLUSIVE DEALS AND ANNOUNCEMENTS. HHS Vulnerability Disclosure, Help Careers. -The mobility of H2O molecules in such a solution is reduced since they are arranged in a specific way around the dissolved ions. Uncategorized. 3. Select all that apply. Stop procrastinating with our smart planner features. Enthalpy change of solution for urea is endothermic ; heat is absorbed from its surrounding during dissolution ; thus causing the surrounding tempe 7 JK-1. All the decay processes occur spontaneously, but the rates Technical urea powder was used to perform the experiments (moisture content of 0.3% d.b., 100% purity, Rose Mills Co, West Hartford, CT). official website and that any information you provide is encrypted Low Temperature Dissolution of Yeast Chitin-Glucan Complex and Characterization of the Regenerated Polymer. perry high school football record. To overcome challenges such as leaching and pollution, studies on formulation properties that influence the densification and, consequently, water diffusion and nutrient release kinetics are essential for optimizing granular fertilizers. a gas expands because matter tends to spread out. Stop procrastinating with our smart planner features. Therefore, this is a spontaneous process. 2016;23:247258. - The greater the freedom of motion of particles in a system, the greater the entropy of the system. Which of the following statements correctly reflect the relationship between the spontaneity of a reaction and the sign of H? The core granules were then drum granulated along with a known percent of fines and water to produce bilayer granules. H2O (l) H2O (s); Ssys = -22 J/K Less porous structures, i.e., higher compaction pressure to produce core granules, along with binder addition resulted in delayed dissolution rates due to binder migration and gelation at the solid-liquid interface. And when youre done, DURABOX products are recyclable for eco-friendly disposal. The .gov means its official. WebUrea dissolution into water as an endothermic reaction is simply the thermodynamic result of the net energy (in this case a positive enthalphy of reaction) of breaking apart the Suniv = -27.2 J/molK For instance, one study found that a dense biopolymer coating controls the nutrient release from granular urea fertilizers [4]. 2021 Feb 10;8(1):014901. doi: 10.1063/4.0000065. The .gov means its official. The wet granulation settings were selected based on the highest percentages of granules in the size range between 2 and 2.8mm and more uniformly coated. - Entropy is a measure of the energy dispersal of a system A spontaneous process can move in a specific direction without the assistance of an external source of energy. Which of the following options correctly describe entropy? What conclusion can you draw about the change in entropy of the surroundings in this process? The particles that underwent incomplete solidification consisted of two parts: (i) an outer dense shell, subjected to fast and uniform solidification due to homogeneous convective heat and mass removal, and (ii) a rough inner core associated with the slow and anisotropic distribution of solidification due to small convective heat removal and low mass transfer rates. Diffusion of small drugs, Effect of drying rate on porosity and tableting behavior of cellulose pellets, Disintegration, and release kinetics of dry compacted urea composites: a formulation and process design study, Computer-aided product design granule dissolution, Characterization of the pore structure of functionalized calcium carbonate tablets by Terahertz Time-domain spectroscopy and X-ray computed microtomography. -For elements with two allotropic forms, the one that is more mobile will have a greater value for standard entropy. -Gases are at a pressure of 1 atm. MeSH Assume no change in K+ concentrations during this process, A process at constant and can be described as spontaneous if and nonspontaneous if . A direct correlation between pore size distribution and disintegration and dissolution times has been established for immediate release pharmaceutical formulas [[1], [2], [3]]. The methane gas upon small energy gain (temperature elevation) burns spontaneously in the air until it is all burned. Molecular dynamics of drug crystal dissolution: simulation of acetaminophen form I in water. See this image and copyright information in PMC, Revisiting the dissolution of cellulose in H. Thermal gelation of cellulose in a NaOH/thiourea aqueous solution. -A gas at 250C vs. the same gas at 100C. The effect of process and formulation variables to improve granule densification and tuning the dissolution profile of fertilizers have not been investigated in detail. The entropy change of the system can be written by Ssystem +Ssurroundings >0 . Mol Pharm. Best study tips and tricks for your exams. 7 JK - 1). Calculate the cost in free energy to move1.00 mol K+ through cell wall by active transport. R.P. (, Variation of the H parameter with temperature for the 5 wt % (grey squares) and 10 wt % (black circles) MCC samples dissolved in NaOH(aq.). is the dissolution of urea a spontaneous process. A key factor that influences reaction spontaneity is changes in the of motion of the particles in the system, i.e. Purification and rapid dissolution of potassium sulfate in aqueous solutions. 2018 Dec 5;10(12):1348. doi: 10.3390/polym10121348. The induction growth process is favored by a large seed/fine size ratio and large Stokes deformation numbers (rapid mixing rates) [13]. What effect does increasing the temperature of a gas have on its entropy, and why? 2CO (g) + O2 (g) 2CO2 (g). or ex. What is the minimum deltaS for this process? Question 10. Therefore, a large particle density would increase the dissolution time. H. 2. -, Alves L., Medronho B.F., Antunes F.E., Romano A., Miguel M.G., Lindman B. Needless to say we will be dealing with you again soon., Krosstech has been excellent in supplying our state-wide stores with storage containers at short notice and have always managed to meet our requirements., We have recently changed our Hospital supply of Wire Bins to Surgi Bins because of their quality and good price. The arrows indicate the. Moreover, the role of certain additives, such as urea, is not consensual among the community. The significantly higher dissolution half-time and third quartile time for gum-added core granules at 100 MPa is related to the interaction between microstructure and formulation design discussed in 3.2.2 Effect of granulation process on porosity and urea dissolution, 3.2.3 Effect of porosity distributions on the dissolution rate. As the temperature of a system increases, the entropy _____ due to a(n) _____ in the number of available energy states and thus a(n) _____ in the number of possible arrangements of molecules within those energy states. Polym. National Library of Medicine A study conducted with a, The particle size of the core granules and bilayer granules are presented in Fig. Carl R. Wassgren: Conceptualization, Resources, Writing review & editing. Which of the following options correctly reflect the relationships between Ssurr, Hsys, and T (at constant pressure so qsys = Hsys)? Which of the conditions described below will result in a spontaneous reaction? Therefore, the boiled egg cannot be changed spontaneously to raw, as a lot of energy is necessary to return all the proteins to its original state. Posted on 8 de June de 2022; By . -The freedom of movement of the particles increases in the change solid liquid gas. As the temperature of a system is increased, all types of kinetic energies increase. What is the main driving force for this reaction? zpnar GA, Beierlein FR, Peukert W, Zahn D, Clark T. J Mol Model. Select all that apply. FOIA Molecular dynamics simulations are used to determine the mechanism of urea crystal dissolution in water under sink conditions. Draw ONE dashed line (----) to indicate a possible location of a hydrogen bond between a water molecule and the urea molecule. However, dissolution time is also driven by the solubility and diffusivity properties of the formulation [8]. A process that occurs under specified conditions without a continuous input of energy. (a) A computer is constructed from iron, copper, carbon, silicon, gallium, and arsenic. Is it possible to prepare a solution that contains Zn2+(aq) and F-(aq) at their standard-state concentrations? Dogs MUST pant to keep cool. They can panic and die if their jaws are too tightly muzzled, especially in the heat. Increase in Ssurr. Since entropy is a state function, the total entropy change for a process is given by S _____ - S _____. -entropy of surrounding increases: exothermic 2022 May 25;27(11):3395. doi: 10.3390/molecules27113395. Holmberg N, Chen JC, Foster AS, Laasonen K. Phys Chem Chem Phys. )Calculate Delta H for the dissoultion of urea. Now, put the value of given data in above equation. Web1. grimsby live car crash / seabrook nh zoning ordinance / seabrook nh zoning ordinance Ssurr is inversely proportional to temperature. In a wet granulation process, such as seed granulation, the collision between particles and between a particle and wall results in granule consolidation and growth. Bethesda, MD 20894, Web Policies Multiple select question. When we dissolve urea in water then endothermic reaction take place due to which energy get absorbed from water so it get cold - increases. Moreover, the role of certain additives, such as urea, is not consensual among the community. There are challenges in the production of granular urea because of its high solubility [5] and highly porous internal structure [6] that can cause leaching of fertilizer byproducts and contamination of aquatic ecosystems. The site is secure. WebA spontaneous process is one that occurs naturally under certain conditions. Biodegradable binders were selected in this study to reduce microplastic pollution due to the use of synthetic polymers or inorganic compounds commonly used for the manufacture of modified release fertilizers [18]. Select all that apply. Stotal = Ssystem +S surroundings >0. Select all that apply. Two unknown reactions (A and B) are analyzed. he first law of thermodynamics states that _____ is always conserved. (b) A container holding a compressed gas develops a leak and the gas enters the atmosphere. If this process is spontaneous, what must be true about the entropy change of the surroundings?
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