Calculating Concentration

Question

Given the following reaction: 2CO(g) + O₂(g) ⇄ CO₂(g) with K_c = 4000. At equilibrium, the concentrations of O₂ and CO₂ are 0.10 M and 0.75 M, respectively. Calculate the concentration of CO at equilibrium.

Answer 1

2CO + O₂ <==> CO₂...

Kc = [CO₂] / [CO]²[O₂]

4000 = (0.75) / (x)²(0.1) = 0.75/0.1x²

400x² = 0.75

x² = 0.001875

x = 0.043 M