For the reaction SO
2(g) + NO
2(g)

SO
3(g) + NO(g), the equilibrium constant is 18.0 at 1,200ºC. If 1.0 mole of SO
2 and 2.0 moles of NO
2 are placed in a 20. L container, what concentration of SO
3 will be present at equilibrium?
◦ 0.48 mol/L
◦ 0.11 mol/L
◦ 0.95 mol/L
◦ 2.22 mol/L
◦ 18 mol/L