At a certain temperature, kc equals 1.4 × 102 for the reaction: 2 co(g) + o2(g) ⇌ 2 co2(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? a) 0.700 mol b) 0.200 mol c) 0.107 mol d) 0.0114 mol