Determine how many liters of nitrogen will be required to produce 87.0 liters of ammonia. The balanced equation for this reaction is: 3H2(g) + N2(g) ==> 2NH3(g).

Answer 1

You can work this as a simple stoichiometry problem. Here is a solved example of one. Just follow the steps.
http://www.jiskha.com/science/chemistry/stoichiometry.html
OR, since all are gases, we can do it the short cut way and use ONLY volumes (not convert to moles).
L N2 = L NH3 x (1 mole N2/2 moles NH3) = 87(1/2) = ??