{\displaystyle \Delta _{\text{f}}H^{\ominus }({\text{O}}_{2})=0} Thermochemical properties of selected substances at 298.15K and 1atm. 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. This final equation is used to determine values of specific enthalpy for a given temperature. 2 CaCN2 The p-Block Elements (XII) Chemistry (2021) Practice questions, MCQs, Past Year Questions (PYQs), NCERT Questions, Question Bank, Class 11 and Class 12 Questions, NCERT Exemplar Questions and PDF Questions with answers, solutions, explanations, NCERT reference and difficulty level . AgNO, Using standard enthalpies information, calculate the standard enthalpy change for this reaction: a) 2Al(s) + Fe2O3(s) = Al2O3(s) + 2Fe(s) (thermite reaction) b) Mg(OH)2(s) = MgO(s) + H2O(l) c) N2O4(g) + 4H2(g) = N2(g) + 4H2O(g) d) SiCl4(l) + 2H2O(l) = SiO, For the following reaction, the change in enthalpy under standard conditions at 25 deg C is -184.6 kJ. CH CaO(s) + CO_2(g) => CaCO_3(s). 6 H 2 O in a large volume of water is endothermic to the extent of 3. It is used in bamboo cannons as well as big-bang cannons. For example, the standard enthalpy of formation of carbon dioxide would be the enthalpy of the following reaction under the above conditions: All elements are written in their standard states, and one mole of product is formed. The formation reaction is a constant pressure and constant temperature process. Calculate the pH of a solution of 0.157 M pyridine.? H2C = CH2 + Br2 gives H2BrC = CBrH2. 5 k c a l / m o l. If H = 2 3. The electric arc furnace method was discovered in 1892 by T. L. Willson, and independently in the same year by H. Calcium carbide can be made by heating calcium oxide with carbon (charcoal). 2H_2(g) + O_2(g) ANSWER: . kJ, Using standard heats of formation, calculate the standard enthalpy change for the following reaction. Commercially available for fuel, calcium carbide is a grayish-white lumpy solid. Calculate the standard enthalpy of formation of CaC2 (s) at 25 C. BrainMass Inc. brainmass.com December 15, 2022, 8:40 pm ad1c9bdddf https://brainmass.com/chemistry/hess-law/standard-enthalpy-formation-298069 Solution Summary CaO(s) + CO2(g) to CaCO3(s), Use standard enthalpies of formation to calculate delta H_rxn for the following reaction. Required fields are marked *. C(s) + H2O(g) to CO(g) + H2(g), 1. Ca (OH)2 (s) + C2H2 (g) ?rH Expert Answer Previous question Next question CaO(s) + 3 C(s) CaC2(s) + CO(g) rH = +464.8 kJ/mol-rxn Is this reaction endothermic or exothermic? Express your answer in terms of x. Water dripping on carbide produces acetylene gas, which burns and produces light. Calcium carbide is another name for a compound represented by the chemical formula CaC2. CO2 (g) + 2KOH (s)H20 (g) + KCO3 (s) You can use the 2HBr(g) + Cl2(g)2HCl(g) + Br2(g), Calculate the standard enthalpy of formation of gaseous di-borane (B_2H_6) using the following thermochemical information: B_2H_6 (g) + 3O_2(g) \to B_2O_3(s) + 3H_2O(l) \\ \Delta H B_2O_3 = -1254.55 KJ \\ \Delta H H_2O = -285.85 KJ \\ \Delta H_{rxn} = -2, Determine the heat of reaction for the decomposition of one mole of benzene to acetylene C6H6(l) \rightarrow 3C2H2(g) given the following thermochemical equations: 2C6H6(l) + 15O2(g) \rightarrow 12CO2(g) + 6H2O(g) ΔH = -6271 kJ 2C2H2(g) + 5O2(g). Fe(s) + 2HCl(aq-->)FeCl2(s) + H2(g) kJ, The standard enthalpy change for the thermal decomposition of silver nitrate according to the following equation is +78.67 kJ. THANKS! H = standard enthalpy (kJ/mol) Responses A. sunlight B. oxygen C.plants D. water. 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 . Using standard heats of formation, calculate the standard enthalpy change for the following reaction. 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The converse is also true; the standard enthalpy of reaction is positive for an endothermic reaction. Calculate the standard enthalpy change for the following reaction at 25 degrees C. MgCl_2(s) + H_2O(l) to MgO(s) + 2HCl(g). been selected on the basis of sound scientific judgment. The standard enthalpies of combustion of graphite and C_2H_2 (g) are -381.26 and -1227.62 kJ mol^-1, respectively. f = -393.5kJ/mol, Calculate ΔH for the following reaction from the standard enthalpies of formations Fe2O3 + 3CO → 2Fe + 3CO2 Fe2O3 : -912.2 kJ CO : -105.0 kJ Fe : 9.7 kJ CO2 : -393.5 kJ, Calculate the heat released when 10.00 grams of CaCl2 are dissolved. 2CH3OH(g) arrow 2CH4(g) + O2(g); Delta H = +252.8 kJ, Determine the heat of reaction for the following chemical reaction: \\ CaO(s) + CO_2(g) \to CaCO_3(s) \\ Given the following equations \\ \begin{matrix} Ca(OH)_2(s) \to CaO(s) + H_2O_4(l) & \Delta H = 65.2\ kJ\\ Ca(OH)_2(s) + CO_2(g) \to CaCO_3(s) + H_2O, Using standard heats of formation, calculate the standard enthalpy change for the following reaction. The standard enthalpy of formation is the enthalpy change when 1 mol of a pure substance is formed from its elements. A sample of a compound of xenon and fluorine was confined in a bulb with a pressure of 18 torr. CO(g) + H2O(g) arrow CO2(g) + H2(g), Calculate the standard enthalpy change for: CaO (s) + H_2O (l) to Ca(OH)_2 (s), Calculate the standard enthalpy change for the reaction at 25 ^oC. It is used in the removal of sulphur from iron. O What is the enthalpy change if 10.0 g of CaO is allowed to react with an excess of carbon? Your Mobile number and Email id will not be published. Use the values of the standard enthalpy of formation and calculate delta H for the following reaction. Deltoid muscle _____ 2. 2 The value of the enthalpy of formation can be used to determine the total enthalpy change . CO(g) + 3H2(g)CH4(g) + H2O(g) ? A scientist measures the standard enthalpy change for the following reaction to be 96.1 kJ: NH4Cl(aq) NH3(g)+HCl(aq). 1.118 of the Thermochemical Network (2015); available at ATcT.anl.gov. Calcium carbide is sometimes used as source of acetylene, which like ethylene gas, is a ripening agent. Learn more about the structure, physical and chemical properties of Calcium Carbide (CaC2) from the expert faculties at BYJUS. 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)? The answer is -60.57. H Using the standard enthalpies of formation, what is the standard enthalpy of reaction? Calcium carbide is produced industrially in an electric arc furnace from a mixture of lime and coke at approximately 2,200C (3,990F). Advertisement pstnonsonjoku The enthalpy of decomposition is 656.3 KJ/mol. 570 K J What is the standard enthalpy change for this rea. Can you Chemistry asked by Rina 512 views 0 answers The combustion reaction for benzoic acid It is also known as calcium acetylide, phenyl glyceryl ether diacetate, and glycerol phenyl ether diacetate. 2NH3(g) + 3N2O(g) \rightarrow 4N2(g) + 3H2O(g), Using standard heats of formation, calculate the standard enthalpy change for the following reaction. 2H_2 O(g). Calculate the enthalpy change for the following reaction (a) using standard enthalpies of formation, (b) using bond energies, (c) if the answers to parts a and b differ, suggest reasons for the differ, Calculate the standard enthalpy change for the following reaction at 25 degrees Celsius. 2 The Kb of pyridine, C5H5N, is 1.5 x 10-9. N_2(g) + 2O_2 (g) ?2NO_2(g) ANSWER: kJ, Using standard heats of formation, calculate the standard enthalpy change for the following reaction. copyright 2003-2023 Homework.Study.com. So the glucose to oxygen ratio is 1:6, or basically we need 6 times as many moles of oxygen gas as we do glucose for the reaction to happen. Carbide lamps were also used extensively as headlights in early automobiles, motorcycles and bicycles, but have been replaced entirely by electric lamps.[18]. [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. An Hinglish word (Hindi/English). par un bon matin de l'an 9, armnius se remmore l'anne o il a connu l'ruption des deux volcans. 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. 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 . 9.79. Bi 14.12 trang 59 SBT Ha hc 10: Mt xe ti ang vn chuyn t n (thnh phn chnh l CaC2 v CaO) gp ma xy ra s c .. Bi 14.13 trang 59 SBT Ha hc 10: Cho phng trnh ha hc ca phn ng .. Bi 14.14 trang 59 SBT Ha hc 10: Cho phn ng phn hy hydrazine .. Passage of an electric spark through the mixture produced Xe and HF. CaC 2 is a chemical compound with a chemical name Calcium Carbide. From the following enthalpy of reaction data, calculate Delta H_f for CaC_2(s). N_2(g) + 2O_2 (g) ?2NO_2(g) ANSWER: kJ, From the standard enthalpies of formation, calculate Δ H o rxn For the reaction C_6H_{12}(l) + 9O_2(g) →6CO_2(g) + 6H_2O(l), Use standard enthalpies of formation to calculate Delta Hrxn for the following reaction. The change in enthalpy does not depend upon the . The standard enthalpies of combustion of graphite and C2H2 (g) are -393.51 and -1299.58 kj/mol, respectively. The specific heat capacity cp is called the specific heat at constant pressure and is related to the universal gas constant of the equation of state. The heat energy that occurs depends on the distance between the electrode and the metal charge in the furnace. 0 kJ/mol. All other trademarks and copyrights are the property of their respective owners. enthalpy of fusion of ice at 0 C is 333 J/g; the enthalpy of vaporization of liquid water at 100 C is 2256 J/g. 227 kJ B. 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. What is the enthalpy of solution of CaCl2? 2BrF_3(g) ? 2H_2O(I) ? Calcium carbide can be reacted with water to produce acetylene and calcium hydroxide. The hydrolysis reaction of Al4C3 can be written as Al4C3+12H2O3CH4+4Al(OH)3. . National Institute of Standards and Become a Study.com member to unlock this answer! 226.77 986.2 + (2*285.83) = -187.77, Add back the total enthalpy that is given in the question -187.77+127.2 = -60.57. During a titration the following data were collected. Use the standard heats of formation, calculate the standard enthalpy change for the following reaction: CaCO_3 (s) to CaO (s) + CO_2 (g), Using the standard enthalpies of formation, of ΔH: H2O(l) = -286kJ/mol; C2H4(g) = 52.3kJ/mol; C2H5OH(l) = -278kJ/mol Calculate the standard enthalpy of reaction for : C2H4(g) + H2O(l) \rightarrow C2H5OH(l), Using standard heats of formation, calculate the standard enthalpy change for the following reaction. What is the enthalpy of calcium? M g C. Use the given standard enthalpies of formation to calculate Δ H ° for the following reaction. Calcium carbide is also used in the desulphirisation of iron. Carbide lamps were still commonly used in early cars, motorcycles, and bicycles as headlights, but were eventually replaced by electric lamps. This precipitate is calcium hydroxide (Ca(OH) 2).However, if ion concentrations of calcium and hydroxyl ions are very low, calcium hydroxide can be dissolved in water and give colorless solution. H_2S(g) + 2H_2O(I) --> 3H_2(g) _ SO_2(g), Using standard heats of formation, calculate the standard enthalpy change for the following reaction. The standard enthalpy change of any reaction can be calculated from the standard enthalpies of formation of reactants and products using Hess's law. Reaction Enthalpy CH3OH (g) CH3OH (l) Hr(298.15 K) = -37.696 0.030 kJ/mol Hr(0 K) = -45.245 0.030 kJ/mol Note: The listed uncertainity of the reaction enthalpy is computed using the full covariance matrix. Table 2 gives this value as 5460 kJ per 1 mole of isooctane (C 8 H 18 ). CO(g)+H2O(g)= CO2(g)+H2(g). This method has not changed since its invention in 1892: The high temperature required for this reaction is not practically achievable by traditional combustion, so the reaction is performed in an electric arc furnace with graphite electrodes. Calculate the enthalpy of formation of SO₂ from the standard enthalpy changes of the following reactions: The standard enthalpy change for the reaction below is 436.6 kJ/mol. 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. + Diaphragm _____ 3. The superscript Plimsoll on this symbol indicates that the process has occurred under standard conditions at the specified temperature (usually 25C or 298.15K). From the following enthalpy of reaction data, calculate Delta H_f for CaC_2(s). 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) ? Calcium carbide is not volatile and not soluble in any known solvent, and reacts with water to yield acetylene gas and calcium hydroxide. Examples are given in the following sections. S. J. Klippenstein, L. B. Harding, and B. Ruscic. This reaction was the basis of the industrial manufacture of acetylene, and is the major industrial use of calcium carbide. Include the sign of the, Using standard heats of formation, calculate the standard enthalpy change for the following reaction. Name the major nerves that serve the following body areas? We also . Es ridculo que t ______ (tener) un resfriado en verano. It is hydrolysed to cyanamide, H2NCN.[5]. AgNO, Determine the heat of reaction for the decomposition of one mole of benzene to acetylene, C_6H_6(l) --> 3C_2H_2(g) given the following thermochemical equations: 2C_6H_6(l) + 15O_2(g) --> 12CO_2(g). All rights reserved. 2B(s) + \frac{3}{2}O_2(g) \rightarrow B_2O_3(s) \ \ \ \Delta H^{\circ} = -1273 kJ \\ B_2H_6(g) + 3 O. S(s) + 3/2 O2(g) ---> SO3(g) Delta H= -395.7 kJ/Mol*rxn SO2(g) + 1/2 O2(g) ----> SO3(g, Calculate the enthalpy of formation of SO2 from the standard enthalpy changes of the following reactions: 2 SO2 + O2 → 2SO3 (change in heat -196kJ) 2 S + 3O2 → 2 SO3 (change in heat -790kJ) S + O2 → SO2, Calculate the delta H of reaction: CS_2(l) + 4H_2(g) => CH_4(g) + 2H_2S(g) a) Calculate the heat of reaction using the following heats of formation (in kJ/mol): CS_2(g) = 117, CS_2(l) = 89.5, CH_4(g) = -74.85, H_2S(g) = -20.6. CaCN3 3. The known standard enthalpy of formation (Delta H) of Ca3(PO4)2 is -4121 kJ. The formation reactions for most organic compounds are hypothetical. Carbide lamps were still used extensively in slate, copper, and tin mines where methane is not a serious hazard. Product side. Use the values of the standard enthalpy of formation and calculate delta H for the following reaction. 2H_2 (g) + O_2 (g) --> 2H_2 O (l) ..kJ/mol b. Learn about enthalpy of reaction and enthalpy change formula. C_2H_4(g) + H_2O(g) to CH_3CH_2OH(g) Answer: _____ kJ. NH_4Cl(aq) rightarrow NH_3(g) + HCl(aq), Using standard heat of formation, calculate the standard enthalpy change for the following equation. [12], Pure calcium carbide is a colourless solid. CO(g) + 1/2O2(g) CO2(g) a) -506 kJ b) -284 kJ c) +284 kJ d) +506 kJ e) -617 kJ. Figure 4C shows the heat map of gene expressions in this signature. [9][10][11] In Jajce, Bosnia and Herzegovina, the Austrian industrialist Dr. Josef Kranz and his "Bosnische-Elektrizitts AG" company, whose successor later became "Elektro-Bosna", opened the largest chemical factory for the production of calcium carbide at the time in Europe in 1899. CO(g) + 3H2(g)CH4(g) + H2O(g) ? (f(HgO(s)) = -90.7 \frac{kJ}{mol} and f(FeO(s)) = -272 \frac{k, From the standard enthalpies of formation, calculate the \Delta H rxn for the reaction: C_6H_12(l)+9 O_2(g)6 CO_2(g)+6 H_2O(l) Given: C_6H_12(l), ? O S = standard entropy (J/mol*K) The overall chemical equation says that 1 mole of glucose reacts with 6 moles of oxygen gas for the reaction to occur. Notice the negative infront of the enthalpy (H) for H2O. It becomes the standard enthalpy of the reaction when the reaction takes place at the thermodynamic standard conditions (298 K, 1 bar and 1 M). Selected ATcT [ 1, 2] enthalpy of formation based on version 1.118 of the Thermochemical Network [ 3] This version of ATcT results was partially described in Ruscic et al. 'Question 3 of 35 of CH,OH completely What is the change in enthalpy in kilojoules (when 3.24 reacted according to the following reaction CHA(g) + Oz(g) AH 252.8 kJ CH;OH(g) STARTING AMOUNT ANSWVER RESET ADD FACTOR 32.00 0.001 4.00 * 10- 25.6 6.022 * 102 2 32.05 0.101 1000 16.05 7.80 * 10-4 3.24 252.8' B. Ruscic, R. E. Pinzon, M. L. Morton, G. von Laszewski, S. Bittner, S. G. Nijsure, K. A. Amin, M. Minkoff, and A. F. Wagner. National Center for Biotechnology Information. Using standard heats of formation, calculate the standard enthalpy change for the following reaction. Me molesta que mis padres no ______ (cuidar) su alimentacin.. 3. Calculate the standard enthalpy of formation of CaCO3 (S). PbO_2 (s) to Pb (s) + O_2 (s), The following reaction has a standard enthalpy of reaction of -146.0 kJ/mol: Cu_2O(s) + 1/2 O_2(g) to 2CuO(s). Enthalpy is used in the energy equation for a fluid. 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. 7 k c a l / m o l. H How does CaC2 differ from Al4c3? (Calcium carbide is then used to make acetylene.) The carbide product produced generally contains around 80% calcium carbide by weight. Br_2(g) + 3F_2(g) ANSWER: _ kJ, Using standard heats of formation, calculate the standard enthalpy change for the following reaction. The CaC2 content of the product is assayed by measuring the amount of acetylene produced on hydrolysis. Using these data, The combustion of 1.00 L of isooctane produces 33,100 kJ of heat. Water dripping on the carbide creates acetylene gas, which burns and emits light. The reaction of calcium carbide with water, producing acetylene and calcium hydroxide,[5] was discovered by Friedrich Whler in 1862. A) Fe_2O_3(s) + 2Al(s)--->Al_2O_3(s) + 2Fe(s) B) H_2(g) + C_2H_4(g)--->C_2H_6(g) C) NH_4Cl(aq), Using standard heats of formation, calculate the standard enthalpy change for the following reaction. H2(g) + F2(g) 2HF(g) _______ kJ. J. Phys. Data from NIST Standard Reference Database 69: The National Institute of Standards and Technology (NIST) Maybe its easier if I write what I did out: The above Hs stand for standard enthalpy of formations. The heat of reaction for one mol of CaC2(s) CaC2 (s)+ 5H2O (l) = CaO (s) +2CO2 (g) + 5H2( g) is equal to 80.2 kJ. CO, 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. CO(g) + 1/2O2(g) arrow CO2(g) a. {\displaystyle {\ce {CH4 + 2O2 -> CO2 + 2H2O}}} Hope that helps. 4 Answers aaja Come. 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. How to Balance CaC2 + H2O = Ca (OH)2 + C2H2 (Calcium carbide + Water) Wayne Breslyn 623K subscribers Subscribe 59K views 4 years ago In this video we'll balance the equation CaC2 + H2O = Ca. The standard enthalpy of formation or the standard heat of formation is used in calculations to determine changes in enthalpy. In conventional combustion, the high temperature needed for this reaction is not technically achievable, so the reaction is performed in an electric arc furnace with graphite electrodes. CO(g) + H_2O(g) rightarrow CO_2(g) + H_2(g) (a) What is the isobaric heat of combustion of ethane, C_2H_6(g), in kJ per mole of etha, The standard enthalpy change for the reaction: 2 H g ( l ) + O 2 ( g ) 2 H g O ( s ) is -211kJ a) What is the value of standard enthalpy of formation HgO? Calculate the standard heat of formation of calcium carbide, CaC2(s), in kJ/mol using the following thermochemical equations. 1. Its density is 2.22 g/cm. Calculate the heats of combustion for the following reactions. Its melting point is 2160 C, and its boiling point is 2300 C. 2021 by the U.S. Secretary of Commerce 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)? 2Na(s) + 2H_2O (l) to 2NaOH (aq) + H_2 (g), Using standard heats of formation, calculate the standard enthalpy change for the following reaction. 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) ? = 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). On this Wikipedia the language links are at the top of the page across from the article title. Calcium carbide (CaC2) reacts with water to form acetylene (C2H2) and Ca(OH)2. 4. All rights reserved. The standard enthalpy change for the following reaction is -72.8 kJ. Use the standard enthalpies of formation. 2CH3OH(g) + 3O2(g) arrow 2CO2(g) + 4H2O(g), What is the standard enthalpy change for the following reaction? CH3CH2OH(l) + 3O2(g) 2CO2(g) + 3H2O(cr,l), O(CH2CH2)(g) + 5/2O2(g) 2CO2(g) + 2H2O(cr,l), 2CH3C(O)Cl(g) + H2CO(g) 2CH3CHO(g) + COCl2(g), CH3CH2(g) + O2(g) CH3CHO(g) + OH(g), CH3CO(g) + HBr(g) CH3CHO(g) + Br(g). In this process, CaC2 was chosen as an additive because the price is quite cheap. Calcium Carbide in its pure form appears as a colourless crystalline solid and is a rock-like structure at room temperature. Standard enthalpy of formation values can be found in this table. 2 k c a l for the reaction C a C l 2 (s) + 6 H 2 (l) C a C l 2 . However you need to multiply H2O by its coefficient from the balanced equation. The measurement of CaO(s) is -635 \frac {kJ}{mol}. _____ 1. CaO(s) + 3 C(s) CaC2(s) + CO(g) . It can be calculated from the standard formation enthalpies of the reactants and the products. 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