7.0 moles of nitrogen and 10.0 moles of water were placed in a 25 liter flask and allowed to reach equilibrium according to the following equation:
2N2(g) + 6H2O(g) « 4NH3(g) + 3O2(g)
At equilibrium, it was determined that 5.0 moles of ammonia were present in the flask. How many moles of water are present in the flask at equilibrium?