Question

At 25oC, the value of Kc for the following reaction is 82. 𝐼2(𝑔) + 𝐶𝑙2(𝑔) ⇌ 2𝐼𝐶𝑙(𝑔) 0.83 mol of I2(g) and 0.83 mol of Cl2(g) are placed in a 10 L container at 25oC. What is the concentration of the three gases at equilibrium?

Answer 1

Consider,

`I_2(g) + Cl_2(g) rightleftharpoons 2ICl(g)`

where, `K_"c" = 82` at `298.15"K"`

Given,

`[I_2]_"i" = [Cl_2]_"i" approx 8.3*10^-2"M"`

Using an ICE table,

`I_2(g) + Cl_2(g) rightleftharpoons 2ICl(g)`

`K_c = (8.3*10^-2 - x)^2/(2x)^2 = 82`

`=> x = 4.34*10^-3`

Hence,

`[I_2]_"eq" = [Cl_2]_"eq" approx 7.87*10^-2"M"`, and

`[ICl]_"eq" = 2x approx 8.69*10^-3"M"`