Answer:
Kc = 0,075
Step-by-step explanation:
For a reaction:
A + B ⇄ xC + yD
Kc =
![([C]^x[D]^y)/([A][B])](https://img.qammunity.org/2020/formulas/chemistry/college/gzozhpc4rz6izkqlikie7qjvsn2394j4zw.png)
For the reaction:
2 HI(g) ⇄ H₂(g) + I₂(g)
Kc =
(1)
In equilibrium:
[HI] = 1- 2x
[I₂] = x [H₂] = x
If 35,4% is dissociated:
[HI] = 1-2x = 0,646 ⇒ x = 0,177
[I₂] = 0,177 [H₂] = 0,177
Replacing in (1):
Kc =
kc = 0,075
I hope it helps!