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Bromine monochloride, BrCl decomposes into bromine and chlorine and reaches the equilibrium: 

for which Kc= 32 at 500 K. 

If initially pure BrCl is present at a concentration of 3.3 × 10-3 molL-1 , what is its molar concentration in the mixture at equilibrium? 

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Let the amount of bromine and chlorine formed at equilibrium be x. The given reaction is: 

Now, we can write, 

Therefore, at equilibrium, 

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