At a certain temperature, kc equals 1. 40 × 102 m-1 for the reaction: 2co(g) + o2(g) ⇌ 2co2(g) if a 3. 50 l flask contains 0. 400 mol of co2 and 0. 100 mol of o2 at equilibrium, how many moles of co are also present in the flask?.