For the reaction 2H2O(g) ⇌ 2H2(g) + O2(g) 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.