What is Keq for the reaction 2502(g) + O2(g) 2503(g)?

Keq= 798 for the reaction: 2502 (g) + O2 (g) # 2503 (g). In a particular mixture at equilibrium, [S02]=4.20 M and [SO3)= 11.0M. ... When a 0.600 moles of SO2 and 0.600 moles of O2 are placed into a 2.00 litre container and allowed to reach equilibrium, the equilibrium (SO3] is to be 0.250M.

Explanation:

aquifers are bounded above and below by impermeable rock. the driving force of groundwater movement in confined aquifers is pressure, rather than gravity.

i do not get it   at all