Ammonia (nh3) is widely used as a fertilizer and in many household cleaners. how much ammonia is produced when 6.44 mol of hydrogen gas react with an excess of nitrogen gas?

The answer would be the Chemical formula for ammonia by hydrogen and nitrogen gas: 1 N2 + 3 H2 --> 2 NH3 then use stoichiometry. You know you have enough nitrogen gas to react, so you can just straight convert mol H2 to mol NH3, where 3 mol H2 = 2 mol NH3. 
3.44 mol H2 * (2 mol NH3 / 3 mol H2) = 2.29 mol NH3

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