The initial ICl concentration is calculated:
[ICl] = n / V = 0.36 mol / 5 L = 0.072 M
It has the expression of Kc:
Kc = [I2] * [Cl2] / [ICl] ^ 2
0.11 = X ^ 2 / (0.072) ^ 2
It clears X = 0.024 M
The equilibrium concentrations are calculated:
[I2] = [Cl2] = X = 0.024 M
[ICl] = 0.072 - 0.024 = 0.048 M
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