In: Chemistry
Answers all supposed to be in M
For the reaction
I2(g)+Br2(g)←−→2IBr(g),
Kc=280 at 150 ∘C. Suppose that 0.550 molIBr in a
2.00-L flask is allowed to reach equilibrium at 150 ∘C.
What is the equilibrium concentration of IBr?
What is the equilibrium concentration of I2?
What is the equilibrium concentration of Br2?
initial concentration of IBr,
[IBr] = number of mol of IBr / volume in L
= 0.550 mol/ 2.00 L
= 0.275 M
I2(g) + Br2(g) <—> 2 IBr(g)
0 0 0.275 (initial)
x x 0.275-2x (at equilibrium)
Kc = [IBr]^2 / [I2][Br2]
280 = (0.275-2x)^2 / (x)^2
(0.275-2x)/x = sqrt(280)
(0.275-2x)/x = 16.73
0.275-2x = 16.73*x
18.73*x = 0.275
x = 0.0147 M
At equilibrium,
[IBr] = 0.275-2x = 0.275-2*0.0147 = 0.0246 M
[I2] = x = 0.0147 M
[Br2] = x = 0.0147 M