A description of the solar system in which all the planets revolve around
the sun is called

Revolution or barycenter

Explanation:

The center of mass of a system of astronomical bodies is called the barycenter. This is the point around which all the planets and other bodies in our solar system, such as comets and asteroids, revolve. Hope it helps:)

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 .

it is the most commonly accepted one