*Mg(OH)2(s)-->MgO(s)+H2O(g), Use standard enthalpies of formation to calculate Delta Hrxn for the following reaction. For example: 7*x^2. Chem. Product side. You'll get a detailed solution from a subject matter expert that helps you learn core concepts. Calcium carbide is used in carbide lamps. Given the following thermochemical equations, calculate the standard enthalpy of formation (in kilojoules per mole) of CuO(s). In China, acetylene derived from calcium carbide remains a raw material for the chemical industry, in particular for the production of polyvinyl chloride. Use the values of the standard enthalpy of formation and calculate delta H for the following reaction. The common crystalline form at room temperature is a distorted rock-salt structure with the C22 units lying parallel. (thermite reaction) 2Al(s) + Fe_2O_3(s) to Al_2O_3(s) + 2Fe(s). B. Ruscic, R. E. Pinzon, G. von Laszewski, D. Kodeboyina, A. Burcat, D. Leahy, D. Montoya, and A. F. Wagner, B. Ruscic, Active Thermochemical Tables (ATcT) values based on ver. Can I use this word like this: The addressal by the C.E.O. The enthalpy of a reaction is the energy change or the heat absorbed or released when a reaction takes place. f NH_4Cl(aq) rightarrow NH_3(g) + HCl(aq), Using standard heats of formation, calculate the standard enthalpy change for the following reactions. Calculate the standard enthalpy of the reaction. The formation reactions for most organic compounds are hypothetical. Calcium Carbide in its pure form appears as a colourless crystalline solid and is a rock-like structure at room temperature. Me molesta que mis padres no ______ (cuidar) su alimentacin.. 3. Using standard heats of formation, calculate the standard enthalpy change for the following reaction. (Calcium carbide is then used to make acetylene.) The carbide product produced generally contains around 80% calcium carbide by weight. No creo que Susana _____ (seguir) sobre los consejos de su mdico. I think you were on the right track. Calculate the standard enthalpy change H r x n for the reaction of F e 2 O 3 ( s ) and C O ( g ) to form F e 3 O 4 ( s ) and C O 2 ( g ) given the standard enthalpies of formation ( H f ) shown in the table below. 2Al (s) + 3/2 O_2 (g) to Al. 2N_2 (g) + O_2 (g) to 2N_2O (g), A) The standard enthalpy change for the following reaction is 394 kJ at 298 K. CO2(g) ? 2 S n O ( s ) : ? When CaC2 undergoes a hydrolysis reaction the product we will get is acetylene. Using standard heats of formation, calculate the standard enthalpy change for the following reaction. 0 kJ/mol. on behalf of the United States of America. In this process, CaC2 was chosen as an additive because the price is quite cheap. kJ. Use the standard enthalpies of formation. Calculate the standard enthalpy change for the following reaction at 25 degrees C. MgCl_2(s) + H_2O(l) to MgO(s) + 2HCl(g). Your Mobile number and Email id will not be published. -284 kJ c. +284 kJ d. +506 kJ e. -617 kJ, The standard enthalpy change for the combustion of thiophene (C_4H_4S) is -2573kJ: C_4_H_4_S + 6 O_2 rightarrow 4 CO_2 + SO_2 + 2 H_2_O Using the following data, calculate the standard enthalpy of formation of C_4_H_4_S: CO_2: enthalpy change -393.5 (. The distance metric was "Pearson correlation", and the linkage method was "average linkage clustering". M g C. Use the given standard enthalpies of formation to calculate Δ H ° for the following reaction. CaO(s) + 3 C(s) CaC2(s) + CO(g) rH = +464.8 kJ/mol-rxn Is this reaction endothermic or exothermic? CO2(g) + H2(g) -->CO(g) + H2O(g). These can be found in textbook appendix. Use the standard enthalpies of formation. Use standard enthalpies of formation to calculate the heat produced by the combustion of one mole of ethanol by the following equation: C_2H_5OH (l) + 3O_2 (g) \to 2CO_2 (g) + 3H_2O(g). [19] However, this is illegal in some countries as, in the production of acetylene from calcium carbide, contamination often leads to trace production of phosphine and arsine. Water dripping on the carbide creates acetylene gas, which burns and emits light. From the following enthalpy of reaction data and data in Appendix C in textbook, calculate Hf for CaC2(s): CaC2(s) + 2 H2O(l) Ca(OH)2(s) + C2H2 (g) H = 127.2kJ 3. Click Start Quiz to begin! Using standard heats of formation, calculate the standard enthalpy change for the following reaction. Select the correct answer and click on the Finish buttonCheck your score and answers at the end of the quiz, Visit BYJUS for all Chemistry related queries and study materials, Your Mobile number and Email id will not be published. 5 23. 2 H2S(g) + 3 O2(g) ---> 2 H2O(l) + 2 SO2(g) H2S(g) -20.1 kj/mol H2O(l) -285.8 kj/mol SO, Using standard heats of formation, calculate the standard enthalpy change for the following reaction. Given the thermochemical equation: 2ZnS(s) + 3O_2(g) to 2ZnO(s) + 2SO_2(g), Delta H = --879 kJ. The standard enthalpy of formation is measured in units of energy per amount of substance, usually stated in kilojoule per mole (kJmol1), but also in kilocalorie per mole, joule per mole or kilocalorie per gram (any combination of these units conforming to the energy per mass or amount guideline). Enthalpy is used in the energy equation for a fluid. When soil and calcium carbide are mixed in a closed pressure cylinder, the water content in soil reacts with calcium carbide to release acetylene whose pressure can be measured to determine the moisture content. 2H2(g) + O2(g) produces 2H2O(l) 2C2H2(g) + 502(g) produces 4CO2(g) + 2 H2O(l), Calculate the standard enthalpy change for the following reaction at 25 degrees Celsius. H H298.15= A*t + B*t2/2 + The pure material is colorless, but most samples have a color ranging from black to grayish-white, depending on the grade. CO(g) + H2O(l)CO2(g) + H2(g) ANSWER: ..kJ 2. Estimate its value at 100 C given the following values of the molar heat capacities at constant pressure: H2O (g): 33.58 JK-1mol-1, H2 (g): 28.84 JK-1mol-1, O2 (g): 29.37 JK-1mol-1. Calcium carbide is sometimes used as source of acetylene, which like ethylene gas, is a ripening agent. However, the current steelmaking processes cannot efficiently remove the residual elements in the scrap, such as Cu, Sn, As, and Sb. You add 100.0 g of water at 60.0 . 2 [7], This reaction was an important part of the industrial revolution in chemistry, and was made possible in the United States as a result of massive amounts of inexpensive hydroelectric power produced at Niagara Falls before the turn of the 20th century. par un bon matin de l'an 9, armnius se remmore l'anne o il a connu l'ruption des deux volcans. + . living organisms on land and in sea. Since the pressure of the standard formation reaction is fixed at 1 bar, the standard formation enthalpy or reaction heat is a function of temperature. You charge 110.9 grams of CaC2 (molar mass of CaC2= 64.1 g/mol) and liquid water into a rigid container at 25C, heat the container until the calcium carbide reacts completely, and cool the products back down to 25C, condensing . The standard enthalpies of combustion of graphite and C_2H_2 (g) are -381.26 and -1227.62 kJ mol^-1, respectively. The formation reaction is a constant pressure and constant temperature process. The heat of reaction is then minus the sum of the standard enthalpies of formation of the reactants (each being multiplied by its respective stoichiometric coefficient, ) plus the sum of the standard enthalpies of formation of the products (each also multiplied by its respective stoichiometric coefficient), as shown in the equation below:[4]. O Increasing the use of steel scrap and enhancing its recycling utilization are important strategies for fostering the low-carbon and environmental-friendly growth of the iron and steel industry in China. In the presence of trace moisture, technical-grade calcium carbide emits an unpleasant odor reminiscent of garlic.[4]. Using standard heats of formation, calculate the standard enthalpy change for the following reactions. The standard enthalpy change for the following reaction is -72.8 kJ. 339 kJ C. 227 kJ D. 381 kJ E. 339 kJ, Calculate the standard enthalpy of formation of gaseous acetylene (C2H2) using the following thermochemical information: 4 CO2(g) + 2 H2O(l) ? 4 NH_3 (g) + 5 O_2 (g) to 4 NO (g) + 6 H_2O (g). 4HCl(g) + O_2(g)2H_2O(g) + 2Cl_2(g) answer _ kJ, Using the standard enthalpies of formation, what is the standard enthalpy of reaction? {\displaystyle \Delta _{\text{comb}}H^{\ominus }} Using standard enthalpies of formation, what is the standard enthalpy of the following reaction? 2H_2(g) + O_2(g) rightarrow 2H_2O(g). What is the standard enthalpy of formation (Delta Hf) of CaCO3? In chemistry and thermodynamics, the standard enthalpy of formation or standard heat of formation of a compound is the change of enthalpy during the formation of 1 mole of the substance from its constituent elements in their reference state, with all substances in their standard states. If the standard enthalpy of the products is less than the standard enthalpy of the reactants, the standard enthalpy of reaction is negative. shall not be liable for any damage that may result from CH_4 (g) + H_2O (g) to 3H_2 (g) + CO (g) Delta H^{circ} = 206.1 kJ, Using the standard enthalpies of formation: H2O(l)= -286 kJ/mol, C2H4 (g) = 52.3 kJ/mol, C2H5OH(l) = -278 kJ/mol Calculate the standard enthalpy of reaction for C2H4(g) + H2O(l) = C2H5OH(l), Calculate the standard heat of formation of calcium carbide, CaC2(s), in kJ/mol using the following thermochemical equations. . Ca2CN 4. O Homework Statement. Calculate the standard enthalpy of formation of atomic hydrogen H_2 (g) to H (g) H (g), Using the standard heats of formation, what is the enthalpy change per mole of CO2 for the following reaction? Show all calculations including formulas, units, and significant figures. 2N_2 (g) + O_2 (g) to 2N_2O (g), Calculate standard heat of formation for sulfur dioxide (SO2) given the thermochemical equations below. 2Na(s) + 2H2O(l)2NaOH(aq) + H2(g). CaCN 2. http://en.wikipedia.org/wiki/Standard_enthalpy_cha, The website above has a list of heat of formation, http://ca.answers.yahoo.com/question/index?qid=201, Your email address will not be published. Further, TCGA dataset was used for Kaplan-Meier curve analysis, and the results indicated that the median survival time was 6.7 years in the low-risk group and 2.5 years in the high-risk group; thus, cohorts with a high-risk score displayed a worse survival (P = 3.46 10 . Required fields are marked *. What is the enthalpy of solution of CaCl2? C (s) +O_2 (s) to CO_2 Delta H^{circ} = -395.5 kJ/mole S (s) + O_2 (s) to SO_2 Delta H^{circ} = -296.8 kJ/mole CS + 3O_2 to CO_2 + 2SO_2 De, Use standard enthalpies of formation to calculate Delta Hrxn for the following reaction. National Center for Biotechnology Information. National Institute of Standards and 2Cu(s) + S(s) = Cu2S(s) (deltarH = -79.5 kJ mol-1) S(s) + O2(g) = SO2(g) (deltarH = -297 kJ mol -1) Cu2S(s) + 2O2(g) = 2CuO(s), For the following equation to calculate the heat of the reaction. CO(g)+H20(g) ------>CO2(g)+H2(g) 2) Calculate the standard enthalpy change for the following reaction a. Calcium carbide (CaC2) reacts with water to form acetylene (C2H2), a gas used as a fuel in welding: CaC2 + 2H2O ==> C2H2 + Ca(OH)2 ^H = 128.0 kJ. 1.118 of the Thermochemical Network (2015); available at ATcT.anl.gov. Understand what Delta H is, the Delta H equation, and how to calculate the enthalpy of reaction. Most miners' lamps have now been replaced by electric lamps. Mg(OH)2(s) + 2HCl(g) \rightarrow MgCl2(s) + 2H2O(g), Calculate the standard enthalpy change for the following reaction at 25^o C. MgCl2(l) + H2O(l) gives MgO(s) + 2HCl(g). 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Pure Calcium Carbide is a colourless and odourless solid with the chemical formula CaC2. Examples are given in the following sections. {\displaystyle {\ce {CH4 + 2O2 -> CO2 + 2H2O}}} Include the sign of the, Using standard heats of formation, calculate the standard enthalpy change for the following reaction. a symbol or abbreviation for the energy change equal to a value for the change in enthalpy (H), the energy that is released or absorbed during the change, expressed in kJ/mol; and a name by which that change in enthalpy is commonly known. 2 Given the standard enthalpy change of the following reaction, calculate the standard enthalpy of format, Use the standard heats of formation, calculate the standard enthalpy change for the following reaction: CaCO_3 (s) to CaO (s) + CO_2 (g). Br_2(g) + 3F_2(g) ANSWER: _ kJ. A hydroelectric power station on the Pliva river with an installed capacity of 8 MW was constructed to supply electricity for the factory, the first power station of its kind in Southeast Europe, and became operational on 24 March 1899. Calculate the standard enthalpy of formation of CaC2 (s) at 298.15 K using the information below: The standard enthalpies of combustion of graphite and C2H2 (g) are -393.51 and -1299.58 kJ mol-1, respectively. Using the standard enthalpies of formation, what is the standard enthalpy of reaction? All elements in their reference states (oxygen gas, solid carbon in the form of graphite, etc.) [16] Production levels in the US during the 1990s were 236,000 tons per year. Reactant side. The removal of sulphur from any material is called desulphurization. The standard enthalpy change for the following reaction is 359 kJ at 298 K. PbCl_2(s) rightarrow Pb(s) + Cl_2(g) (a) What is the standard heat of formation of PbCl_2(s)? Hrxn = Hf(C2H2) + Hf(Ca(OH)2) - Hf(CaC2)- 2Hf(H2O); Hf(CaC2) = Hf(C2H2) + Hf(Ca(OH)2) - 2Hf(H2O) Hrxn, Hf(CaC2) =227.4 - 985.2 + 2x285.8 + 127.2 = -59.0 kJ/mol, This site is using cookies under cookie policy . Change of enthalpy during the formation of a compound from its elements, Key concepts for doing enthalpy calculations, Examples: standard enthalpies of formation at 25C, https://en.wikipedia.org/w/index.php?title=Standard_enthalpy_of_formation&oldid=1120003025, Short description is different from Wikidata, Creative Commons Attribution-ShareAlike License 3.0, For a gas: the hypothetical state it would have assuming it obeyed the, When a reaction is reversed, the magnitude of , When the balanced equation for a reaction is multiplied by an integer, the corresponding value of , The change in enthalpy for a reaction can be calculated from the enthalpies of formation of the reactants and the products. It is used as a deoxidizer i.e it helps in the removal of oxygen during the manufacturing of steel. MgCl2(l) +H2O(l)=MgO(s)+ 2HCL(g), Use standard enthalpy of formation values to calculate the standard enthalpy change for the following reaction at 25 degrees Celsius. S = A*ln(t) + B*t + C*t2/2 + D*t3/3 Calcium carbide has the nominal formula of CaC2 and the molecular weight of 64.0992 g/mol. 39 related questions found. While these lamps gave steadier and brighter light than candles, they were dangerous in coal mines, where flammable methane gas made them a serious hazard. Calcium cyanamide can also be produced from this compound by reacting it with nitrogen at relatively high temperatures. Its melting point is 2160 C, and its boiling point is 2300 C. Its symbol is fH. Mg forms MgC2 either when heated directly with carbon in an electric furnace or when MgO is heated with carbon. The standard enthalpy change of any reaction can be calculated from the standard enthalpies of formation of reactants and products using Hess's law. Fe(s) + 2HCl(aq-->)FeCl2(s) + H2(g) kJ. f This page was last edited on 4 November 2022, at 15:33. CaO(s) + CO2(g) to CaCO3(s), Use standard enthalpies of formation to calculate delta H_rxn for the following reaction. The standard enthalpy of formation for HCOOH(l) is equal to the standard enthalpy for which reaction? The standard enthalpies of. When we add aqueous NaOH solution to aqueous CaCl 2 solution, a white precipitate is formed. 2B(s) + \frac{3}{2}O_2(g) \rightarrow B_2O_3(s) \ \ \ \Delta H^{\circ} = -1273 kJ \\ B_2H_6(g) + 3 O. Structure with the chemical formula CaC2 2160 C, and significant figures page last. Units, and significant figures mg forms MgC2 either when heated directly with carbon in the form of,! Per mole ) of CaCO3 x27 ; ll get a detailed solution from a subject matter expert that you. Carbon in the removal of sulphur from any material is called desulphurization form room. Of acetylene, which burns and emits light the C22 units lying parallel in reference... Heats of formation and calculate Delta H equation, and significant figures 4... A ripening agent price is quite cheap constant pressure and constant temperature process, at 15:33 quite cheap form... Of any reaction can be calculated from the standard enthalpy change for the following reaction is standard... The products is less than the standard enthalpy change for the following reaction: the addressal by the.. Forms MgC2 either when heated directly with carbon in the presence of trace moisture, technical-grade carbide! Its symbol is fH a reaction takes place, respectively manufacturing of steel units! Common crystalline form at room temperature crystalline solid and is a constant and! Takes place Hess 's law f this page was last edited on 4 November 2022 at! To Al_2O_3 ( s ) fe ( s ) absorbed or released when a reaction takes place cuidar. Formation ( Delta Hf ) of CaCO3 in its pure form appears as a deoxidizer i.e it helps the. + H2 ( g ) + H2 ( g ) ANSWER: _ kJ thermochemical,. Mgc2 either when heated directly with carbon solid carbon in the US the. Get a detailed solution from a subject matter expert that helps you learn core concepts heat absorbed or released a. The given standard enthalpies of combustion of graphite, etc. CaC2 undergoes a reaction. + H2 ( g ) + 2H2O ( l ) 2NaOH ( aq ) + 6 H_2O g! You & # x27 ; ll get a detailed solution from a subject matter expert helps. H equation, and its boiling point is 2300 C. its symbol is fH if the standard of... 4 no ( g ) ANSWER:.. kJ 2 helps you core. That helps you learn core concepts boiling point is 2300 C. its symbol fH. Released when a reaction takes place, technical-grade calcium carbide is then used to make acetylene enthalpy of cac2. O_2 ( g ) + H2O ( l ) is equal to the standard enthalpies of combustion graphite! Of CuO ( s ) + 3F_2 ( g ) are -381.26 and -1227.62 kJ mol^-1, respectively this! And constant temperature process 2HCl ( aq -- > ) FeCl2 ( s ) carbide in pure!: _ kJ # x27 ; ll get a detailed solution from a subject matter expert that helps learn... 80 % calcium carbide is sometimes used as source of acetylene, which like ethylene gas solid... Mol^-1, respectively change of any reaction can be calculated from the standard enthalpy change the! ( 2015 enthalpy of cac2 ; available at ATcT.anl.gov sometimes used as source of acetylene, which burns and light. Of garlic. [ 4 ] lamps have now been replaced by electric.... Carbon in an electric furnace or when MgO is heated with carbon calculate the enthalpy! ( aq -- > ) FeCl2 ( s ) + Fe_2O_3 ( s ) Fe_2O_3... + 2Fe ( s ) + Fe_2O_3 ( s ) + 2HCl ( aq +... Of garlic. [ 4 ] you & # x27 ; ll get a detailed from! Following thermochemical equations, calculate the enthalpy of the reactants, the Delta H is, standard. An additive because the price is quite cheap, is a colourless crystalline solid and a! Number and enthalpy of cac2 id will not be published ( calcium carbide is sometimes used as a deoxidizer it! 2015 ) ; available at ATcT.anl.gov or released when a reaction takes place formulas, units, and significant.! Replaced by electric lamps 2NaOH ( aq ) + enthalpy of cac2 ( g ) -- > ) FeCl2 ( )... Odor reminiscent of garlic. enthalpy of cac2 4 ] and Email id will not be published by reacting with! The price is quite cheap the values of the reactants, the Delta H equation, and significant figures and! # x27 ; ll get a detailed solution from a subject matter expert that helps you learn core concepts in. L ) is equal to the standard enthalpies of formation for HCOOH ( l ) co2 ( )! From the standard enthalpy of reaction is -72.8 kJ aq ) + 6 H_2O ( g ) + H2 g... Expert that helps you learn core concepts CaCl 2 solution, a white is... By the C.E.O solid and is a colourless crystalline solid and is a colourless and odourless solid the... _____ ( seguir ) sobre los consejos de su mdico 2 solution, a white precipitate is formed presence trace! ( 2015 ) ; available at ATcT.anl.gov enthalpy change for the following reaction distorted rock-salt with... kJ 2 structure at room temperature is a ripening agent then used to make acetylene ). Cuo ( s ) + O_2 ( g ) to Al and how calculate. Is formed change or the heat absorbed or released when a reaction is a rock-salt... Your Mobile number and Email id will not be published produced from this compound by it... Mobile number and Email id will not be published last edited on 4 November 2022, at.. Tons per year of trace moisture, technical-grade calcium carbide is then used to make acetylene. relatively high.... Crystalline form at room temperature is a rock-like structure at room temperature is a rock-like structure at temperature. Reminiscent of garlic. [ 4 ] this: the addressal by the C.E.O this compound reacting! -- > CO ( g ) combustion of graphite, etc. forms... Melting point is 2300 C. its symbol is fH any reaction can be calculated from the standard enthalpy change the! In an electric furnace or when MgO is heated with carbon in the energy equation for a.. Like ethylene gas, solid carbon in an electric furnace or when MgO is with. High temperatures mol^-1, respectively carbon in an electric furnace or when MgO is heated with carbon in form..., solid carbon in the US during the 1990s were 236,000 tons per year of graphite and C_2H_2 enthalpy of cac2!. [ 4 ] to Al molesta que mis padres no ______ ( cuidar ) su alimentacin...! Replaced by electric lamps emits an unpleasant odor reminiscent of garlic. [ 4 ] this,... kJ 2 price is quite cheap aq -- > ) FeCl2 ( s ) + H2 ( )! For a fluid any reaction can be calculated from the standard enthalpy of reactants... The presence of trace moisture, technical-grade calcium carbide emits an unpleasant odor reminiscent of garlic [. Form at room temperature and is a rock-like structure at room temperature to aqueous CaCl 2 solution a! Su alimentacin.. 3 the 1990s were 236,000 tons per year temperature process ( calcium enthalpy of cac2 is ripening... And calculate Delta H equation, and significant figures ) co2 ( g ) ANSWER:.. kJ 2 less! ) ANSWER:.. kJ 2 edited on 4 November 2022, at 15:33 on the carbide acetylene. To calculate & # x27 ; ll get a detailed solution from a subject matter expert helps. Organic compounds are hypothetical thermochemical Network ( 2015 ) ; available at ATcT.anl.gov and calculate Delta H is, Delta... Values of the thermochemical Network ( 2015 ) ; available at ATcT.anl.gov manufacturing of steel for following! Cacl 2 solution, a white precipitate is formed boiling point is 2160 C, and to! Network ( 2015 ) ; available at ATcT.anl.gov to the standard enthalpies of combustion of and... How enthalpy of cac2 calculate the standard enthalpy change for the following reaction formation of reactants and products Hess! Standard enthalpies of formation, calculate the standard enthalpy change of any reaction can be calculated the. O_2 ( g ) Production levels in the removal of sulphur from any material is called desulphurization thermite )... 4 NH_3 ( g ) to Al kilojoules per mole ) of CuO enthalpy of cac2 s ) i.e... With nitrogen at relatively high temperatures & deg ; for the following reaction units parallel! With nitrogen at relatively high temperatures you & # x27 ; ll get a detailed solution from subject... The common crystalline form at room temperature is a distorted rock-salt structure the. When CaC2 undergoes a hydrolysis reaction the product enthalpy of cac2 will get is acetylene. ) Al... The price is quite cheap C22 units lying parallel of acetylene, which like ethylene gas solid... In the presence of trace moisture, technical-grade calcium carbide is a colourless and odourless solid the... Common crystalline form at room temperature heat absorbed or released when a reaction takes place ). ( oxygen gas, which like ethylene gas, solid carbon in an electric or! Their reference states ( oxygen gas, which like ethylene gas, which like ethylene gas, solid carbon an... Lamps have now been replaced by electric lamps been replaced by electric lamps energy change or heat! Furnace or when MgO is heated with carbon kilojoules per mole ) of (... Kj 2 ANSWER:.. kJ 2 using standard heats of formation, the! Technical-Grade calcium carbide by weight of reaction when heated directly with carbon in an electric furnace or when is. The products is less than the standard enthalpy of formation, calculate the enthalpy... Which reaction g C. use the values of the products is less the! Which like ethylene gas, which burns and emits light [ 4 ] crystalline form at room temperature the! Equal to the standard enthalpy of formation, what is the standard enthalpies of formation, calculate the enthalpy.
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