At a certain temperature, 0.900 mol of SO3 is placed in a 2.00-L container.

2SO3 (g) 2SO2 (g) + O2 (g)

At equilibrium, 0.130 mol of O2 is present. Calculate Kc.

Kc = 2.34 mol*L

Explanation:

The calculation of the Kc of a reaction is performed using the values of the concentrations of the participants in the equilibrium.

A + B ⇄ C + D

Kc = [C] * [D] / [A] * [B]

According to the reaction

Kc = [SO2]^2 * [O2]^2 / [SO3]^2

Knowing the 0.900 mol of SO3 is placed in a 2.00-L it means we have a 0.450 mol/L of SO3

0.450 - -> 0 + 0 (Beginning of the reaction)

0.260 - -> 0.260 + 0.130 (During the reaction)

0.190 - -> 0.260 + 0.130 (Equilibrium of the reaction)

Kc = [0.260]^2 + [0.130]^2 / [0.190]^2

Kc = 2.34 mol*L