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2. A sealed 1 is charged with oeco mol of 12 and oeoo mol of Brz. An librium reaction ensues: 12 (g) Br2 (g) 21Br (g) is the When the container contents achieve equilibrium, the flask contains 1.05 mol of TBr What value of Keq
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Answer #1

I2 (g) + Br2 (g) <-----> 2IBr (g)
initial moles 0.6 0.6 0
change -x -x +2x
Equb conc 0.5-x 0.5-x 2x

But given that the equilibrium moles of IBr = 1.05
---> 2x = 1.05
--> x = 0.525 moles
So Equilibrium moles of I2 & H2 = 0.6-x
= 0.6 - 0.525
= 0.075 moles
Equilibrium constant , keq = [IBr]^2 / ( [I2][Br2])
= 1.05^2 / ( 0.075*0.075)
= 196

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