Assuming all volume measurements are made at the same temperature and pressure, how many liters of water vapor can be produced when 8.23 liters of oxygen gas react with excess hydrogen gas? Show all of the work used to solve this problem.
Unbalanced equation: H2 (g) + O2 (g) H2 O(g)

Question

Assuming all volume measurements are made at the same temperature and pressure, how many liters of water vapor can be produced when 8.23 liters of oxygen gas react with excess hydrogen gas? Show all of the work used to solve this problem. 
Unbalanced equation: H2 (g) + O2 (g)   H2 O(g)

aaronq · Answer

balance the equation, then use the coefficients to find the yield.

You first have to convert everything to moles since in stoichiometric problems, everything is dealt with in moles, not grams.