How can you separate ammonia from ammonia and nitrogen?

Nitrogen and hydrogen are combined, using a form of magnetite (iron) as a catalyst. This process is called the Haber-Bosch process of ammonia synthesis.

there is more nitrogen than hydrogen

Ammonia contains about 82.35 % nitrogen by mass.

The conversion of ammonia into nitrates is performed primarily by soil-living bacteria plus other nitrifying bacteria. The primary stage of nitrification, the oxidation of ammonia is performed by...

If you compress and cool an ammonia-oxygen gas mixture, the ammonia will condense and become a liquid. By slowly venting the container in which the mixture is held, the oxygen will escape and leave...