Explain the terms exothermic and endothermic, ... H2(g) + I2(g) 2HI(g) Read the following relating to the Haber process: “The raw materials for this process are hydrogen and nitrogen. H2(g) + I2(g) + 53kJ ---> 2HI(g) ... since the 53 kJ is on the left side of the equation, we know that this reaction is endothermic, because it must absorb 53 kJ of energy for the reaction to occur. So it's the reaction. Hydrogen bromide breaks down into diatomic hydrogen and bromine in the reaction shown. ... Use this graph to deduce whether the reaction is … H2(g) + I2(g) -----> 2HI(g) (a) A hydrogen molecule and iodine molecule approach each other. The equation is shown. (2 marks) (b) Propose the two elementary steps for this reaction based on the energy profile and state the intermediate. Hydrogen bromide breaks down into diatomic hydrogen and bromine in the reaction shown. (c) Sketch the energy profile diagram for the reaction with and without catalyst. Add an answer. Chemical Reactions. Explain. At equilibrium, the flask contains 90.4g HI. a. 6. Balance the atom which is the maximum in number; on either side of chemical equation. Answer: It is a combination reaction. 2. Study Resources. ☆★☆★☆★☆★☆★. Solution for Which of the following reactions are endothermic and exothermic A. C2H4 +3O2 --> 2CO2 + 2H2O +heat B. N2+ 2O2 + heat --> 2NO2 C. 2H2O +heat… I2 vapor is consumed in this equilibrium shift to the left. In an exothermic reaction if the temperature is increased then the reaction proceeds in backward direction and vice-versa. This can be understood b... A decrease in temperature is like removing “heat”, which disturbs the system. However, when a mixture of the gases is irradiated with the wavelength of light equal to the … Hence ... is endothermic, while the reverse reaction (production of H2 and I2) is exothermic. Is the reaction exothermic or endothermic? Learn about exothermic and endothermic reactions and the transfer of energy with GCSE Bitesize Chemistry (AQA). The reaction in which heat energy is absorbed is called endothermic reaction. Learning Resources. initially contains 0.763g H2 and 96.9g I2. 4. Some of the information relating to exothermic and endothermic reactions is summarised in Table 12.1. [HI] remains constant. For an endothermic reaction, increasing the temperature will always shift the reaction to the right, or toward the products. This will increase the... H2 + I2 → 2HI. Can you help me to solve it? Answer (1 of 3): It isn’t. I don't know how to get the answer at all. (b) The two molecules form an activated complex. 2HI(g) H2(g) + I2(g) When H2 is added to the reaction at equilibrium, the rate of the reverse reaction increases. Examples with Table I Exothermic, the heat of reaction is negative. 2HCl (g) with a ? Express your answer … 1x2kJ c) d) None The process; CHscOOH—s CH,c00-4He, should be c) neither exothermic nor endothermic d) exothermic or endothermic upon The mixing of gases is generally accompanied by a) decrease in entropy b) dexrease in free energy c) change in heat content d) increase in free energy At constant pressure, heat flow equals enthalpy change: If the enthalpy change listed … Question: Is the following reaction endothermic or exothermic? ii.how much heat is released or absorbed when 1.00 g of NaOH is dissolved in water under standard conditions at 25 oC. b. -9 KJ/mol, exothermic. Your assumption was partially correct in that the change would produce more products, but this change is too negligible to really shift the equilibrium. A.–9 kJ/mol, endothermic. Class XI Equilibrium Page 225 D. Both reactions are endothermic. In exothermic reactions, heat is leaving the system, so the graph will end up at a lower delta H value in the products compared to the reactants. My book says that this sentence is true, but I do not agree. Additionally HI can be prepared by simply combining H2 and I2. Explain your answer. Re: H2+I2----> 2HI equilibrium shift. Chemistry-Dr.Bob. What is the equilibrium constant for the reaction H2+I2<->2HI? Compared to distilled water, an aqueous salt solution has. 2HI(g) H2(g) + I2(g) The equilibrium mixture was found to contain 0.023 mol of hydrogen. Chemical equilibrium is achieved when the forward reaction rates and backward reaction rates are same. So although overall it is in equilibrium but... Exothermic and endothermic reactions. . A loss of I2 vapor results in a less intense purple color. This equilibrium is an exothermic one. 2 CO (g) + O2 (g) --> 2 CO2 (g) + 566.0 kJ ΔH =566 kJ Reactants Products Why is N2 + O2 gives 2NO an endothermic reaction Whereas all other oxidation reactions are exothermic - Science - Chemical Reactions and Equations. The reaction absorbs energy. of oxygen atoms becomes equal on both sides. Explain your answer. Chemistry questions and answers. The basic definition of acids and bases. The pH scale typically runs from 0 to 14 (it’s possible to exceed those limits, but not common). The lower... The molecular mass of water (H2O) is 18.02amu. The data given for the reaction 2\ HI \rightleftharpoons H_2 + I_2 have absolutely … 1 1 . The energy of the reactant is 732 KJ/mol, and the energy of the products is 630 KJ/mol. Chem_Mod Posts: 21255 Joined: Thu Aug 04, 2011 8:53 pm Has upvoted: 1135 times. [H2] decreases. Is H2 plus I2---2HI combination reaction? Request Answer. Right next to the equation, I will write the equilibrium expression. By ; johan eriksson mora jobb до is h2+i2 2hi exothermic or endothermic; 28/05/2022; is h2+i2 2hi exothermic or endothermicostron pris restaurangostron pris restaurang 0.14 mol Mg and 0.14 mol I2. H2(g) + I2(g) ® 2HI(g) 2HI(g) ® H2(g) + I2(g) If the first reaction is carried out in a closed vessel, it seems to stop after some time. 20 Reviews. In this equation, the number of oxygen atom is the maximum on the RHS. Thief!! [5] Uzaam. ΔH is negative (exothermic) For an exothermic reaction we can envision “heat” as a product, then treat it like any other reactant or product when applying Le Chatelier’s principle. So Fredericka and affirming so from the U foes Mission Giffen we should be able to know that this reaction we require energy because we increase te mature we real force, um, the cash to decrease the degree of the association. Express your answer in kJ. Equilibrium question …. H2(g) + I2(g) %3C=%3E 2HI(g) ……… ΔH is negative (exothermic) For an exothermic reaction we can envision “heat” as a product... The number of pairs of electrons in a covalent bond equals the bond order. Top. Reaction Mechanisms H2(g) + I2(g) 2HI (g) Step 1: I2↔ 2I Step 2: 2I + H2↔ 2HI I2 + H2↔2HI Species that appear in some steps but not in the net equation are known as intermediates. Consider the following equilibrium: 2SO2 (g) + O2 (g) ⇄ 2SO3 (g) When a 0.600 moles of SO2 and 0.600 moles of O2 are placed into a 2.00 litre container and allowed to reach equilibrium, the equilibrium [SO3] is … 2HI(g) → H2(g) + I2(g) (a) Define reaction rate. The teacher replies: “That’s because you were given two different salts. [O2] = 8.60 X 10-3 M 3. Is this an endothermic or exothermic reaction? The equilibrium constant, K for the reaction: 2HI(g)H2(g)+I2(g)at room temperature is 2.85 and at 698K is1.4×10-2. The heat of formation of NO is positive (as is the \DeltaG), meaning that this reaction is endothermic and endergonic. 2. In an endothermic reaction, Δ H is greater than zero because the energy of the reactants is less than the energy of the products. Consider the second-order reaction: 2HI(g)→H2(g)+I2(g)Use the simulation to find the initial concentration [HI]0 and the rate constant k for the reaction. combustion reactions have H < 0), but some spontaneous processes are endothermic (e.g. 2H2 + O2 → 2H2O. In an exothermic reaction, heat is a product. A temperature decrease removes some of that “product,” so the equilibrium should shift to the right t... The breaking of bonds is an endoenergetic process and the formation of bonds is an exoenergetic process. (i) Calculate the number of moles of iodine and the number of moles of hydrogen iodide in the equilibrium mixture. H2 (g) + I2 (g) ->2HI (g) The activation energy for the formation of HI is 167kJ and for the decomposition of HI is 139kJ. H2 + I2 → 2 HI For many years, this reaction was considered to involve a simple bimolecular reaction between molecules of H2 and I2. Learn about exothermic and endothermic reactions and the transfer of energy with GCSE Bitesize Chemistry (AQA). Equilibrium shifts to the left. A reaction mixture in a 3.67L flask at a certain temp. Identify the limiting reagent in of the reaction mixtures. Science. Chemistry. [H2] increases. moles per liter. Pressure affects the position of a reaction of two gases if the number of molecules before the reaction is different from the number of molecules a... 5. 2HBr—>H2+Br2. In an experiment, equal amounts of hydrogen and iodine were mixed together, and the equilibrium mixture of the three gases in a container of volume 1 dm 3 at 723K was found to contain 1.5 moles of iodine. See all cards. Many spontaneous processes are exothermic (e.g. Add your answer: Is H2 I2 2HI exothermic or endothermic? Predict the effect of increasing the temperature on the reaction: H 2 (g) + CO 2 (g) ⇌ H 2 O (g) + CO (g) ΔHr = +41.2 kJ mol −1. It has been national bestseller for more than 65 years. 4.0. 2HBr → H2 + Br2. When a chemical reaction occurs, energy is transferred to or from the surroundings. keep in the association off I was hydrogen. NCERT Solutions; Board Paper ... dissociation energy.Due to this a large amount of energy is required to break this bond and thus the oxidation of N 2 is endothermic. Therefore N2 is almost inert to reactions at low temperatures. So we need to supply energy to break the triple bond in N2 and similarly the double bonds in O2. Therefore this reaction is endothermic. C.9 kJ/mol, exothermic. A lot of [HI] decreases. If you search for "standard enthalpy of formation hydrogen iodide", you get positive value $\pu{26.5 kJ/mol}$, what means the reaction is endothermic, as by convention, the values for elements in their standard state is zero. There is no simple way to look at this reaction and say whether it will be exothermic or endothermic, because first you have to break the bonds between the hydrogen atoms in the H_2 molecules and between the iodine atom in the I_2 molecules (this requires energy, an endothermic step) then the bonds between the hydrogen and iodine atoms can be formed … However, it was not as simple as that: the rate of any reaction increases with the temperature, so working with temperature alone, one has the choice between a high product yield achieved only very slowly, or a very low yield quickly. What type of reaction is H2 I2 -> 2HI? Joined Nov 7, 2011 Messages 487 Gender Undisclosed HSC 2013 Aug 5, 2012 #1 2H2O2--> 2H2O + O2 The enthalpy for the reactant is 2144 Kj/mol and for the product is 1424 Kj/mol. endothermic, if energy transferred to surroundings when new bonds are made greater then exothermic. Jul 28, 2016 ... Can we determine whether a reaction is endothermic or exothermic? ice melting has H > 0). The temperature will increase if the reaction is exothermic, decrease if the reaction is endothermic, and not change if no energy is evolved in the reaction. 1x2kJ c) d) None The process; CHscOOH—s CH,c00-4He, should be c) neither exothermic nor endothermic d) exothermic or endothermic upon The mixing of gases is generally accompanied by a) decrease in entropy b) dexrease in free energy c) change in heat content d) increase in free energy At constant pressure, heat flow equals enthalpy change: If the enthalpy change listed … For an exothermic reaction, where does the equilibrium shift with a rise in temperature? An exothermic reaction produces heat, so write heat as one... At equilibrium, what happens if I{eq}_2{/eq} is removed from the reaction mixture at constant temperature and volume? (1 point) A. Example: H2 + I2 2HI, ∆H = + 52.2 KJ. 18.02g/mol. What is the equilibrium constant for the reaction H2 g )+ I2 g ⇌ 2HI g at 700 K? The concentration of a solution can be expressed in. Jan 17,2021 - Among the following, the equilibrium which is not affected by an increase in pressure is:a)2SO3(g)⇔2SO2(g) + O2 (g)b)H2 (g) +I2(s) ⇔ 2HI(g)c)C(s) +H2O(g)⇔CO (g) + H2 (g)d)3Fe(s) + 4H2O(g)⇔ Fe3O4(s) + 4H2(g)Correct answer is option 'D' Because of the weak hydrogen bonding the molecules are … It can be represented as. Calculate the equilibrium constant(Kc) for the reaction at . Similarly, the second reaction (decomposition of HI) also is not complete inside a closed vessel and stops after a while. Search: Explain Why H2 Is A Gas And I2 Is A Solid. Fe + 4 x H2O → Fe3O4 + H2. Consider the following endothermic reaction: H2 (g) + I2 (g) = 2HI (g) If the temperature is decreased, more HI will be produced. 1) ... H2(g) + I2(g) → 2HI(g) 3) C(s) + O2(g) → CO2(g) 1) exothermic 2) endothermic 3) exothermic. What will be the concentration of HI after t = 3.92×1010 s ([HI]t) for a reaction starting under the condition in the simulation? It has been used by more than 2 million students. Chapter 17 Section 1 The Reaction Process p. 560-567. EXAM TMRW H2(g) + I2(g) 2 HI(g) The forward reaction above is exothermic. ... Is this reaction endothermic or exothermic? 3 a Energy transferred from the surroundings to break bonds to overcome attraction between atoms, so separated atoms have more energy stored than original molecule. H2 (g) +12 (g) +energy (heat) + 2 HI (g) Select the correct answer below: endothermic exothermic neither endothermic nor exothermic both endothermic and exothermic FEED. 2. Increasing the rate of the reverse reaction will mean a decrease in products. [HI] increases. Answer: The equilibrium constant for the reaction 2HI-H2+I2 is 0.0114 at 600k. From the Le Châtelier law alone, it is apparent that this exothermic reaction is favored by low temperature and high pressure. Our housing. As the reaction is exothermic, according to Le- Chatelier principle, the equilibrium will move backwards that means the rate of forward reaction wi... There is usually a temperature change. ... Is the reaction exothermic or endothermic? What is the degree of dissociation of gaseous HI at equilibrium at this temperature? Wiki User. Preface The Essentials of Physical Chemistry has been written for BSc students. Answer B.9 kJ/mol, endothermic. Guess when the temperature increase the percentage association increase. (b) Determine the rate of disappearance of HI when the rate of I2 formation is 1.8×10-6 M s-1. H2 (g) + I2 (g) 2 HI (g) The forward reaction above is exothermic. At equilibrium, what happens if I2 is removed from the reaction mixture at constant temperature and volume? select all that apply 1.) No. LeChatelier’s principle says if you apply a stress to a system at equilibrium, the equilibrium will shift to reduce the stress. Think of an exother... The energy released by forming bonds between nitrogen and oxygen is less than the energy required to … Is the following reaction endothermic or exothermic? Explain. Dynamic equilibrium means that the molecules or ions of reactants and products are continuously reacting. 1 . It is 26 editions old. Jul 28, 2016 - Exothermic reactions release energy. –9 kJ/mol, exothermic B.9 kJ/mol, exothermic C. 9 kJ/mol, endothermic D. –9 kJ/mol, endothermic 1 102 kJ/mol, exothermic Answer to Solved For the endothermic reactionH2(g) + I2(g) Science; Chemistry; Chemistry questions and answers; For the endothermic reactionH2(g) + I2(g) <-----> 2HI (g)which of1) increasing the pressure2) decreasing the volume3) increasing the temperaturewill shift the equilibrium toward the products?Please show your reasoning!also how do I know how many … In this reaction the energy involved in the breaking of bonds in H 2 and I 2 is great in quantity than the energy released in the formation of bonds in HI. If 0.5 molL–1 of HI(g) is present at equilibrium at 700 K, what are the concentration of H2(g) and I2(g) assuming that we initially started with HI(g) and allowed it to reach equilibrium at 700 K? Chemistry. 150 atoms of Mg and 100 molecules of I2. H of -184.6 kJ. For myself, when I discuss this concept with students I like to write the chemical equation (in a generic way) as exothermic or endothermic. An increase in temperature of an endothermic reaction (i.e ΔH= +ve) will shift the equilibrium forward. Answer (1 of 4): Le Chatelier’s principle states “that if a system in chemical equilibrium is subjected to a disturbance it tends to change in a way that opposes this disturbance.” So if a system is at equilibrium and you add more reactants, … answered. Energy is absorbed in the reaction. jaya349740 is waiting for your help. Use the chemical equation and the bond diagram to answer the question. A. H = + q c a l, so the reaction is favored by increasing the temperature because the reaction is endothermic as per given information. Enter only a numerical value, do not enter units. Rewrite the equation with the heat term on the correct side and draw a potential energy diagram. Be notified when an answer is posted. H2 (g)+I2 (g)→2HI (g), given; H-H bond energy: 436 kJ/mol, I-I bond energy: 151 kJ/mol, H-I bond energy: 297 kJ/mol. So some of the sulfur trioxide would change back to sulfur dioxide and oxygen to restore equilibrium. 1 . exothermic. This method is usually employed to generate high purity samples. What is the total energy of the reaction? ️. 1 ; 3 b structural diagram of methane and oxygen, showing C–H After forming the activated complex, (c) the complex may break apart to re- form the original substances, or (d) it mays break apart to form one or more new substances.) I2(s) + energy ==> I2(g) As a sample of I2(s) sublimes to I2(g), the entropy of the sample (1) increases because the particles are less randomly arranged (2) increases because the particles are more randomly arranged (3) decreases because the particles are less randomly arranged (4) decreases because the particles are more randomly arranged 1. Nature tends to become more disordered or random. 100 atoms of Mg and 100 molecules of I2. The reaction releases energy. Add your answer and earn points. Multiplying both sides of this equation by − T, and rearranging yields the following: −TΔSuniv=ΔH−TΔS. However, if a match is lit, the reaction is … 2HI (backwards/forwards) H2 + I2 At 298 K, Kc= 1.3 x 10^-3, whereas at 783 K, Kc= 2.2 x 10^-2 Is the reaction exothermic or endothermic, and why? Let me first reveal the identity of your salts: Salt A is ammonium nitrate () and Salt B is calcium chloride ( )." Equilibrium shifts to the right as endothermic reaction favours the products. It really has been that long. Calculate the equilibrium [O2] in this mixture. Your Response. [H2] remains constant. For example: C (s) + H 2 O (ℓ) → CO (g) + H 2 (g) Δ H > 0. According to the kinetic molecular theory, where does the pressure exerted by a gas in a container come from? The equilibrium constant for the … What is the total energy of the reaction? C. The breakdown of hydrogen bromide is endothermic, and the formation of hydrogen iodide is exothermic. Enter the email address you signed up with and we'll email you a reset link. [H2] decreases. [H2] remains constant. [HI] increases. [HI] decreases. [HI] remains constant. i tried releases energy, H2 decreases, and HI increases. You didn't place an arrow. If the reaction is H2 + I2 ==> 2HI + heat and you remove I2, the reaction will shift to the left. That means, a. (H2) increases. b. (a) Is this reaction an exothermic or an endothermic reaction? Endothermic reactions consume energy. Thread starter leesh95; Start date Aug 5, 2012; L. leesh95 Member. What is the enthalpy change for this reaction and is it endothermic or exothermic? Show transcribed image text The following reaction is exothermic and it is at equilibrium. H2(g)+I2(g)+energy(heat) 2HI(g) endothermic. 2HBr - H2 + Br2 The energy of the reactant is 732 kJ/mol and the energy of the products is 630 kJ/mol. (i) Calculate the number of moles of iodine and the number of moles of hydrogen iodide in the equilibrium mixture. Science Worksheets. Problems 14 Entropy of a system typically increases, S > … The first law requires that qsurr = − qsys, and at constant pressure qsys = Δ H, and so this expression may be rewritten as the following: ΔSuniv=ΔS−ΔHT. A) HI(g) is removed. it is definetily exothermic as h2 is mkore stable then 2h therefore it has less potential eneergy so the product in the reaction have less energy therefore the heat of reaction is negative a.Decide: if the dissolution of NaOH in water at 25 oC is an endothermic or exothermic process. H2 (g) + I2 (g) <=> 2HI (g) ………. Δ H is the enthalpy change of the system. D.9 kJ/mol, exothermic. 300. Which of the following factors will cause the equilibrium H2(g) + I2(g) ---> 2HI(g) , H = +15 kJ/mol to be shifted to the left (in favor of reactants)? 300. Answers: 1 Explain why fluorine forms only one oxoacid, HOF Water is the most plentiful compound on Earth and is essential to life 30 mol of I2, 0 + ⇄ I2(g) 2HI(g) 4 + ⇄ I2(g) 2HI(g) 4. Consider the reaction: Mg + I2 -> MgI2. ∙ 2012-07-16 22:17:15. An increase in temperature of an exothermic reaction (i.e ... will shift the equilibrium forward. H2 + I2 2HI What happens if the following occur? If 1.00 mol H2 and 2.00 mol I2 are introduced into an empty 0.50 L reaction vessel, find the equilibrium concentration of all components at 400 degrees Celcius. 9 KJ/mol, exothermic. H2 (g)+I2 (g)⇌2HI (g)ΔH=−9.4kJ (exothermic) Because this reaction is exothermic, we can write it with heat as a product. Learn about exothermic and endothermic reactions and the transfer of energy with GCSE Bitesize Combined Science (AQA). At equilibrium, what happens if I2 is removed from the reaction mixture at constant temperature and volume? The energy of the H–H bond is 432 kJ/mol. some HI will decompose, forming H2 and I2 the magnitude of the equilibrium constant will increase. This implies that the forward reaction is (1) Exothermic (2) Endothermic (3) Neither exothermic nor endothermic (4) Unpredictable Equilibrium Chemistry - 100Q Question Bank Practice questions, MCQs, Past Year Questions (PYQs), NCERT Questions, Question … Can you say whether the temperature of the surroundings increase, decrease, or remain the same in this process? Question 7.15 At 700 K, equilibrium constant for the reaction H2(g) + I2(g) <---> 2HI(g) is 54.8. Ex. ... a reaction which absorbs energy is endothermic C) in an exothermic reaction, heat is released D) in an endothermic reaction, heat is absorbed The formation of HI from H2 and I2 is an example of gaseous homogeneous equilibrium reaction. 2HI H2 I2 2 moles of HI disappears for every one mole of H2 or I2 that forms from SCH 4UI at Southwood Secondary School. Let us consider that one mole of H2 and one mole of I2 are present initially in a vessel of volume V dm3. (ii) Write an expression for Kc for the equilibrium. I2 has a larger dipole than Cl2 The molecules change their structure as the iron is oxidized, eventually becoming iron oxide (Fe 2 O 3) . I stuck on this problem. 1 . Is this reaction endothermic or exothermic? H2 (g)+ I2 (s)? H2 (g) + I2 (g) <=> 2HI (g) + heat. -102 kJ/mol, endothermic B. Answers from Science - Chemistry - Chemical Equation. Here, Hydrogen and Iodine combine to form Hydrogen iodide. Re: Exothermic vs. Endothermic in forwards backwards reactio. Therefore, the change in H will be negative (smaller H - larger H < 0). If you are doing a demonstration, making a cold pack, or just seeking examples of endothermic reactions and processes, there are other chemicals you can react to get a lowered temperature: Barium hydroxide octahydrate with ammonium chloride. The forward reaction above is exothermic. At 723K, hydrogen and iodine react together and the following equilibrium is established: H2(g) + I2(g) <==> 2HI(g) The value of Kc for this equilibrium is 64. Is this reaction endothermic or exothermic? Hydrogen is obtained by reacting natural gas – … remove some HI add some H2 remove some l2 increase temperature add a catalyst Hydrogen gas and oxygen gas can be kept in the same container for a long period of time without a reaction occurring. To balance the oxygen one needs to multiply the oxygen on the LHS by 4; so that the number. Want this question answered? Main Menu; by School; by Literature Title; by Subject; Textbook Solutions Expert Tutors Earn. 0.16 mol Mg and 0.25 mol I2. The energy of the reactant is 732 kJ/mol, and the energy of the products is 630 kJ/mol. Hydrogen bromine breaks down into diatomic hydrogen and bromine in the reaction shown. What is the molar mass of water? We say that the equilibrium shifts to decrease the concentration of H2 and thus to form more HI. H2 (g) + I2 (g)-- > < -- 2HI(g) ∆H=-10.4 kJ. At 400 degrees Celcius Kc=64 for the equilibrium H2(g)+I2(g)-->2HI(g). Le Chatelier's principle predicts that the equilibrium will shift to decrease the concentration of products. H2 + I2 → 2HI What is the total energy of the reaction? How much heat is released during the formation of 3.78 mol HCl (g) in this reaction: H2 (g)+Cl2 (g) ? NA. One of your salts generated an endothermic reaction with water, while the other salt generated an exothermic reaction with water. By ; johan eriksson mora jobb до is h2+i2 2hi exothermic or endothermic; 28/05/2022; is h2+i2 2hi exothermic or endothermicostron pris restaurangostron pris restaurang Chemistry questions and answers. 2H–H + O=O → 2H–O–H. Choose whether the reaction is exothermic or endothermic. The other one is strongly endothermic, what you realize, if you search the same for nitric oxide. 2HI(g) -><- H2(g) + I2(g) The equilibrium mixture was found to contain 0.023 mol of hydrogen.
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