posted by Andres .
4.0 L of hydrogen gas reacts with 2.0 L of nitrogen gas (at the same temperature and pressure), producing ammonia gas, NH3. Find the limiting reactant.
Write the equation and balance it.
Use L N2 and determine L NH3 produced.
Use L H2 and determine L NH3 produced.
The SMALLER of the two will be the correct one to choose and that reagent will be the limiting reagent.