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Q: Chemistry Question ( Answered ,   0 Comments ) Question
 Subject: Chemistry Question Category: Science > Chemistry Asked by: medicine_man-ga List Price: \$4.50 Posted: 27 Sep 2006 22:29 PDT Expires: 27 Oct 2006 22:29 PDT Question ID: 769139
 ```I am having trouble with the following question my workings come to an answer of 5.10 but this is clearly incorrect I got to this via the following.. [NOCl]2 0.454 ------- = ----- = 5.10 [NO]2[Cl2] 0.089 Question: For the following system at equilibrium: 2NO(g) + Cl2(g) - Eq - 2NOCl(g) 0.416 mol NO, 0.515 mol Cl2 and 0.311 mol NOCl are found in a 1.0L container at 25oC. Calculate the equilibrium constant, K, at 25oC. Answer: a) 2.82 b)3.49 c)0.921 d)1.09 Please show me the workings on how you got to your answer. Cheers.``` Subject: Re: Chemistry Question Answered By: livioflores-ga on 28 Sep 2006 00:27 PDT Rated: ```Hi!! What is equilibrium constant (K)? It is a constant at a given temperature such that when a reversible chemical reaction aA + bB = cC + dD has reached equilibrium. It is given by the following formula: [C]^c * [D]^d K = ---------------------- [A]^a * [B]^b Where [X] is the molar concentration of the reactants and products (moles of solute per litre of solvent). For this problem you have: - A system at equilibrium: 2NO(g) + Cl2(g) - Eq - 2NOCl(g) ; with 0.416 mol NO, 0.515 mol Cl2 and 0.311 mol NOCl in a 1.0L container at 25°C. The above means that: [NO] = 0.416 [Cl2] = 0.515 [NOCl] = 0.311 Then: K = (0.311^2) / (0.515 * 0.416^2) = = (0.097) / (0.089) = = 1.09 For further reading and examples see: "Equilibrium Constant": http://www.cartage.org.lb/en/themes/Sciences/Chemistry/Inorganicchemistry/Equilibrium/Equilibrium/Equilibrium.htm "ChemTeam: Calc of Equilibrium Constant": http://dbhs.wvusd.k12.ca.us/webdocs/Equilibrium/Calc-K-from-equilib-conc.html "Calculating_Equilibrium_Constants": http://www.chem.purdue.edu/gchelp/howtosolveit/Equilibrium/Calculating_Equilibrium_Constants.htm Search strategy: "equilibrium constant" chemical "Molar concentration" equilibrium I hope this helps you. Feel free to request for a clarification if you need it. Regards, livioflores-ga```
 medicine_man-ga rated this answer: ```I can't believe I make a silly mistake like that :) Thanks for your help great answer. Cheers.```  