Consider the following substances: C, O, H,,H, O, NaCl, CO,, Fe and Fe, Og. Indicate whether each substance is a) an element or a compound, or b) an atom or a molecule.
Element
Compound
Atom
Molecule

the reaction mixture contains some ammonia, plus a lot of unreacted nitrogen and hydrogen. the mixture is cooled and compressed, causing the ammonia gas to condense into a liquid. the liquefied ammonia is separated and removed. the unreacted nitrogen and hydrogen are then recycled back into the reactor .