Hydrogen Chloride, HCl, decomposes at moderate temperatures according to the equation.   2HCl(g)  <==> H2(g) + Cl2(g)  The equilibrium mixture was found to contain 0.45mol of Cl2  in a 3-L vessel that started out with 4.00 mol of HCl . The temperature started and remained at 500K until equilibrium was reached. What is the Kc for the decomposition of HCl at this temperature?

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Chapter18: Chemical Equilibrium
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Hydrogen Chloride, HCl, decomposes at moderate temperatures according to the equation.  

2HCl(g)  <==> H2(g) + Cl2(g) 

The equilibrium mixture was found to contain 0.45mol of Cl2  in a 3-L vessel that started out with 4.00 mol of HCl . The temperature started and remained at 500K until equilibrium was reached. What is the Kc for the decomposition of HCl at this temperature?

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