Chapter 12, Problem 43E

For the reaction

$2{\text{H}}_2\text{O}\left(g\right)\rightleftharpoons 2{\text{H}}_2\left(g\right)+{\text{O}}_2\left(g\right)$

K = 2.4 × 10⁻³ at a given temperature. At equilibrium in a 2.0-L container it is found that [H₂O (g)] = 1.1 × 10⁻¹ M and [H₂(g)] = 1.9 × 10⁻² M. Calculate the moles of O₂(g) present under these conditions.