Question
Bromine monochloride (BrCl) decomposes into bromine and chlorine and attains the equilibrium:
for which Kc = 32 at 500 K. If initially pure BrCl is present at a concentration of 3·30×10–3 mol L–1 what is its molar concentration in the mixture at equilibrium?
Solution
The reaction is
Initial moles/litre
3.30 x 10-3 mol-1 0 0
At equilibrium
(3.30 x 10-3 -x) x/2 x/2
where x moles of BrCl decompose in order to attain equilibrium.
Applying the law of chemical equilibrium
Putting the values in expression (1), we have
On taking the square root, we have,
At equilibrium
Initial moles/litre
3.30 x 10-3 mol-1 0 0
At equilibrium
(3.30 x 10-3 -x) x/2 x/2
where x moles of BrCl decompose in order to attain equilibrium.
Applying the law of chemical equilibrium
Putting the values in expression (1), we have
On taking the square root, we have,
At equilibrium
