Assuming all volume measurements are made at the same temperature and pressure, how many liters of oxygen gas would it take to react completely with 7.25 liters of hydrogen gas? Show all of the steps taken to solve this problem.

Question

Unbalanced equation: H2 (g) + O2 (g) yields H2 O(g)

Answer 1

Balance the equation. The long way is to follow these steps which will solve almost any stoichiometry problem.
http://www.jiskha.com/science/chemistry/stoichiometry.html

There is a short cut that may be used when all of the materials are in the gaseous hase. Just use volume, convert frm one material to another by using the coefficients in the balanced equation you have it.