4hh4 4d

1. sumatera 4d Introduction Ammonia (NH 3) is an indispensable chemical in industry and agriculture because it is not only a precursor to the production of many types of fertilizers, chemicals, and pharmaceuticals, but also a clean, carbon-free energy carrier whose combustion products (nitrogen and water) are all environmentally benign. sumatera 4d 1–3 Nitrogen fixation, converting nitrogen (N 2)—the most