1) Balanced reaction:
2H2 (g) + O2 (g) -> 2H2O(g)
2) mole ratio:
1 mol O2 : 2 mol H2O
3) Ideal gas equation => at constant pressure and temperature, Volumen is proportional to the number of moles.
Then the ration of liters is the same ratio of moles:
1 L O2 : 2 L H2O
4) Use the proportion to find the number of liters of water produced:
8.5 L O2* 2 L H2O / 1L O2 = 17 L
5) Answer: 17L of H2O
