Here is a worked example of a stoichiometry problem. Just follow the steps. Remember, to convert grams of a gas to volume, 1 mole of a gas at STP occupies 22.4L.
http://www.jiskha.com/science/chemistry/stoichiometry.html
How many liters of H2 are needed to produce 2.00g of NH3?
N2+3N2 ---> 2NH3
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