Ice Table Chemistry

At 1000 K, 0.250 mol SO##_2## and 0.200 mol O##_2## react in a 10.0 L reaction vessel to form 0.162 mol of SO##_3## at equilibrium. What is K##_{eq}## at 1000 K for the reaction?
2 SO##_2## (g) + O##_2## (g) ##\leftrightharpoons## 2 SO##_3## (g)